JP3762257B2 - Raw material pulverization method for powder, granule, etc. - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pulverization method capable of efficiently obtaining raw material particles having a desired particle diameter by finely pulverizing a powdery or granular raw material such as agricultural products and minerals.
[0002]
[Prior art]
As one of the pulverization methods for pulverizing raw materials such as agricultural products and minerals, the powder and particles of the raw material to be pulverized are moved in an airflow generated in the pulverizer and pulverized by colliding the raw material particles. There is a so-called gas pulverization method. In this pulverization method, an air flow is generated around each rotor blade by rotating both rotor blades in a casing provided with the first rotor blade and the second rotor blade having the same shape facing each other. In this method, the raw material particles that move on each airflow collide with each other by colliding with each other.
[0003]
[Problems to be solved by the invention]
However, when this pulverization method is carried out, the raw material can be finely pulverized, but if a part of this raw material contains particles that are much larger than the desired pulverized particle size, it will take a long time to pulverize to the desired pulverized particle size. The efficiency is not sufficient. In addition, it is difficult to obtain an optimal airflow depending on the characteristics of the raw material particle size, hardness, softness, etc., or depending on the desired particle size, so that it is difficult to perform efficient pulverization. could not.
[0004]
The present invention has been proposed in view of the above, and an object thereof is to provide a pulverization method having excellent raw material pulverization efficiency.
[0005]
[Means for Solving the Problems]
The present invention has been made to achieve the above object, and the invention according to claim 1 is directed to an interior of a casing provided with a first rotor blade provided with a plurality of blades and a second rotor blade facing each other. In addition, the raw material is supplied from the first rotor blade side, and the raw material is moved on the airflow generated by the rotation of both rotor blades .
The raw material particles moving on this air current, or the particles and the casing inner surface, or the particles and each rotor blade collide to pulverize the raw materials ,
It is a raw material pulverization method for powders, granules, etc., characterized in that the operation of a suction device communicating with the casing is started from the middle of pulverizing the raw material to adjust the state of the airflow in the casing .
[0007]
The invention according to claim 2 is characterized in that the state of the airflow in the casing is adjusted by changing the gap between the tip of at least one of the first rotating blade or the second rotating blade and the inner surface of the casing. It is a raw material grinding | pulverization method of the powder of Claim 1 , a granular material, etc.
[0008]
According to a third aspect of the invention, by varying the distance between the first rotating blade and the second rotating blade, which are opposite to each other, according to claim 1 or claim 2, wherein the adjusting the state of air flow in the casing powder according to a raw material pulverizing method of the granular material or the like.
[0009]
According to a fourth aspect of the present invention, the casing is divided into a first side casing member on the first rotor blade side, a second side casing member on the second rotor blade side, and an intermediate casing member connecting the side casing members. 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,
2. The state of the airflow in the casing is adjusted by replacing the intermediate casing member with one having a different width and changing the distance between the first rotary blade and the second rotary blade facing each other. To a raw material crushing method for powders, granules and the like according to any one of claims 1 to 3 .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
First, the outline | summary of the grinder 1 for implementing the grinding | pulverization method in this invention is demonstrated. Of course, the pulverizer 1 does not limit the present invention.
FIG. 1 is a cross-sectional view of a pulverizer 1, which is an embodiment for carrying out the present invention, and FIGS.
[0011]
The crusher 1 is provided in the casing 2 with the first rotary blades 5 and the second rotary blades 6 that are rotationally driven by the motors 3 and 4 facing each other on the coaxial line, and the inside of the casing 2 is used as a crushing chamber 7. A raw material inlet 8 to be pulverized is communicated with the first rotary blade 5 side of the casing 2, and close to the second rotary blade 6 side of the casing 2 from the rotation center of the support shaft of the second rotary blade 6. The exhaust port 9 is communicated, and the suction port 10 is connected to the discharge port 9 to provide a schematic configuration.
[0012]
The casing 2 is a cylindrical member that is closed at both ends in the lateral direction, and has an inner diameter that gradually increases from the left and right ends toward the center by tilting the left and right corners with the same inner diameter at the axially central portion. A peripheral surface 21 and a second inclined inner peripheral surface 22 are formed. A first bearing 23 is provided at the central portion of the left end portion of the casing 2, and the first support shaft 24 of the first rotary blade 5 is rotatably supported by the first bearing 23, and the seal ring 25 is supported by the first bearing 23. Is provided between the pulverization chamber 7 and the pulverization chamber 7 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 to form an extended cylinder inner peripheral portion 26, and a second bearing 27 is provided outside the extended cylinder inner peripheral portion 26. The second bearing 27 supports the second spindle 28 of the second rotor blade 6 in a rotatable manner, and a seal ring 29 is provided between the second bearing 27 and the crushing chamber 7. Prevents raw material particles from entering.
[0013]
The casing 2 includes a boundary between the cylindrical inner peripheral surface 41 having the same inner diameter and the first inclined inner peripheral surface 21 on the inlet 8 side, and the second inclined inner peripheral surface 22 and the cylindrical inner periphery on the outlet 9 side. The first side casing member 42 formed with the first inclined inner peripheral surface 21, the intermediate casing member 43 formed with the cylindrical inner peripheral surface 41, and the second inclined inner peripheral surface 22. It can be separated into three members of the second side casing member 44 that is formed.
[0014]
As described above, the first side casing member 42 has the first inclined inner peripheral surface 21 whose inner diameter gradually increases from the left end inside, and the convex portion 46 is formed in a ring shape at the right opening end. And the 1st inclination inner peripheral surface 21 opens the opening part (input opening communication opening) 47 which connects the insertion port 8. FIG.
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 disposed 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 direction of the rotation axis. In this embodiment, the slide base 51 is a mechanism that is moved by the ball screw 55 and the motor 56, but is not limited thereto.
[0015]
The intermediate casing member 43 forms a ring-shaped plane perpendicular to the rotation axis in a portion that contacts the first side casing member 42, and a recess 58 is provided in a ring shape inside the ring-shaped plane. The concave portion 58 has an inner diameter that can be fitted to the outer diameter of the convex portion 46 of the first side casing member 42, and has a depth that is the same as the height of the convex portion 46. Therefore, when the intermediate casing member 43 and the first side casing member 42 are brought into contact with each other, the concave portion 58 and the convex portion 46 are fitted, and the tip end surface of the convex portion 46 comes into contact with the bottom surface of the concave portion 58 without any gap. Can do. For this reason, it is possible to prevent the raw material particles in the crushing chamber 7 from leaking from between the intermediate casing member 43 and the first side casing member 42.
[0016]
Further, the intermediate casing member 43 also forms a ring-shaped plane perpendicular to the rotation axis in a portion that contacts the second side casing member 44, and a recess 59 is provided in a ring shape inside the ring-shaped plane. Similar to the recess 58, the recess 59 can be fitted with a protrusion of a second side casing member 44 described later.
[0017]
As described above, the second side casing member 44 has the second inclined inner peripheral surface 22 having an inner diameter gradually increasing from the right end, and extends near the center of the right end outward in the axial direction. A cylinder inner peripheral portion 26 is formed. The extension cylinder inner peripheral portion 26 is provided with an opening (discharge port communication opening) 61 communicating with the discharge port 9. The discharge port 9 connects the suction device 10 via the connection channel 62.
The suction device 10 is configured to change operating conditions such as suction pressure and suction flow rate.
[0018]
Similarly to the first side casing member 42, the second side casing member 44 forms a convex portion 64 in a ring shape at a portion in contact with the intermediate casing member 43, that is, at the left opening end.
The second side casing member 44 and the motor 4 are fixed to the base 52, and are arranged so that the rotation axis of each motor 3, 4 and the axis of each support shaft 24, 28 are in a straight line.
[0019]
The first side casing member 42, the intermediate casing member 43, and the second casing member are thus configured, and the ring-shaped convex portion 64 formed at the opening end of the second side casing member 44, and the intermediate casing member The slide base 51 on which the first side casing member 42 is installed is connected to the second side casing member with a ring-shaped recess 59 formed at one open end (right side in the figure) of 43. When moving toward 44, a ring-shaped convex portion 46 formed at the open end of the first side casing member 42 and a ring formed at the other open end (left side in the figure) of the intermediate casing member 43 The intermediate casing member 43 is attached in a state of being sandwiched between the first side casing member 42 and the second side casing member 44.
[0020]
In the present embodiment, the first side casing member 42 is provided with the slide base 51 and the moving mechanism so that the first side casing member 42 can move. However, the present invention is not limited to this, and the first side casing member 42 is fixed to the base 52. Even if the second side casing member 44 is provided with a slide base and a moving mechanism, the same effect can be obtained. Moreover, you may provide a slide base and a moving mechanism in the both-side casing members 42 and 44, respectively.
[0021]
Next, the rotor blades 5 and 6 will be described.
The first rotary blade 5 has six blades 69 attached radially to a boss 68 fixed to the tip of the first support shaft 24, and the blades 69 are equally spaced in the circumferential direction of the boss 68. It is arranged. Similarly, the second rotary blade 6 has six blades 71 attached radially 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 and 71 can be set as appropriate, it is desirable to set a wide space between the blades 69 and 69 and between the blades 71 and 71 in order to allow airflow to be described later.
[0022]
And each wing | blade 69 ..., 71 ... inclines the tip corner part, and forms the 1st blade | wing inclination surface 75 ... and the 2nd blade | wing inclination surface 76 ... as shown in FIG. The first blade inclined surface 75... Sets the inclination angle with respect to the rotation axis as the same angle as the inclination angle of the first inclined inner peripheral surface 21. Similarly to the first blade inclined surface 75..., The second blade inclined surface 76... Is set to have the same inclination angle as the inclination angle of the second inclined inner peripheral surface 22. In the present embodiment, each of the angles is set to 45 degrees.
Further, the tip surfaces 77..., 78... Of each blade 69... 71 are formed in parallel with the rotation axis and also in parallel with the cylindrical inner peripheral surface 41 of the intermediate casing member 43.
[0023]
When the first rotary blade 5 and the second rotary blade 6 are attached to the pulverizer 1, the first blade inclined surface 75 and the first inclined inner peripheral surface 21 face each other in parallel. Similarly, the second blade The inclined surfaces 76 and the second inclined inner peripheral surface 22 face each other in parallel, and gaps 81a,. And these gaps 81a ..., 82a ... can be used as a part of the crushing chamber 7 through airflow and particles. Since these gaps 81a,..., 82a, etc. are constant intervals, the air flow is not narrowed down while passing through the gaps 81a,..., And therefore the direction along the inclination of the inclined inner peripheral surfaces 21, 22 It is easy to maintain the air velocity.
Like the blade inclined surfaces 75..., 76..., The tip surfaces 77... 78 of the blades 69. 81b ..., 82b ... are formed. These gaps 81b,..., 82b can be used as a part of the crushing chamber 7 through the airflow and the particles. Since the airflow is not narrowed in the gaps 81b, 82b, etc., the airflow velocity in the rotation axis direction can be easily maintained.
[0024]
In addition, it is desirable to be able to control the particle collision frequency during rotation so that the rotational speeds of the rotary blades 5 and 6 are appropriately changed, for example, 3000 to 10000 rpm.
[0025]
By the way, the crusher 1 of this embodiment has the spacers 84 and 85 attached to the attachment portions of the rotary blades 5 and 6 on the support shafts 24 and 28. These spacers 84 and 85 are for adjusting the mounting positions of the rotary blades 5 and 6 in the direction of the rotation axis. For example, the spacers 84 and 85 have a cylindrical shape provided so that the inner diameter is fitted to the support shafts 24 and 28. It is a member.
Each of the support shafts 24 and 28 to which the spacers 84 and 85 and the rotor blades 5 and 6 are attached is provided with the rotor blade mounting portions 86 and 87 having reduced diameters at the tips. An abutting portion is provided at the base portion.
[0026]
Thus, the spacers 84 and 85 and the respective support shafts 24 and 28 are configured, and the spacer 84 is fitted to the rotary blade mounting portion 86 of the support shaft 24, and one opening end portion of the spacer 84 and the rotary blade of the support shaft 24 are fitted. The abutting portion of the attachment portion 86 is abutted. Then, the rotor blade 5 is attached to the rotor blade attachment portion 86 of the support shaft 24, and the boss 68 of the rotor blade 5 and the other opening end portion of the spacer 84 are brought into contact with each other. Similarly, the spacer 85 is fitted into the rotor blade attachment portion 87 of the support shaft 28, and one opening end portion of the spacer 85 is brought into contact with the contact portion of the rotor blade attachment portion 87 of the support shaft 28. Then, the rotor blade 6 is attached to the rotor blade attachment portion 87 of the support shaft 28, and the boss 70 of the rotor blade 6 and the other opening end portion of the spacer 85 are brought into contact with each other. Then, each rotor blade 5 and 6 can adjust the attachment position to each spindle 24 and 28 with the spacers 84 and 85, Therefore The space | interval G between both rotor blades 5 and 6 can be adjusted. At the same time, the positions of the rotary blades 5 and 6 with respect to the casing can be adjusted. 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 gaps 82a between the second blade inclined surfaces 76 can be adjusted.
[0027]
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 gaps 81a..., 82a are prepared according to the characteristics of the raw material to be processed from these spacers 84 and 85. If the spacers 84 and 85 that can be set are selected and attached to the support shafts 24 and 28, the interval G can be easily adjusted, and at the same time, the inclined inner peripheral surfaces 21 and 22 and the blade inclined surfaces of the casing. It is possible to easily adjust the gaps 81a to 82a to 75 to 76.
[0028]
A plurality of intermediate casing members 43 having different cylindrical lengths (axial lengths) are prepared, and a gap G between the rotary blades 5 and 6 suitable for the raw material characteristics can be set from these intermediate casing members 43. When the intermediate casing member 43 is selected and attached between the first side casing member 42 and the second side casing member 44, a gap G that cannot be adjusted by the spacer can be set. Therefore, it can cope with a wider range of pulverization conditions.
[0029]
Next, a method for pulverizing raw materials such as powder and granules using the pulverizer 1 having the above-described configuration will be described. First, a case where the first rotary blade 5 and the second rotary blade 6 are rotated in the same direction while operating the suction device 10 will be described.
[0030]
First, as preparation for raw material crushing, the space in the crushing chamber 7 and the suction device 10 are adjusted.
For the space in the crushing chamber 7, the spacers 84, 85 and the intermediate casing member 43 are selected and attached to the crusher 1, the gap G between the rotary blades 5, 6 and the casing 2 and the blades 69. Are adjusted according to the characteristics of the raw material to be crushed. When the adjustment of the space in the grinding chamber 7 is completed, the convex portion 46 of the first side casing member 42 and the concave portion 58 of the central casing member 43, and the convex portion 64 of the second side casing member 44 and the central casing member 43 The recess 59 is fitted to assemble the casing 2, and the first rotary blade 5 and the second rotary blade 6 are rotated in the same direction by the motors 3 and 4 to generate an air flow in the casing 2.
[0031]
Then, the suction device 10 is operated and the operating conditions such as the suction pressure and the suction flow rate of the suction device 10 are changed in consideration of the raw material to be pulverized and the desired pulverized particle size. Adjust the condition. For example, when the raw material particles include particles that are much larger than the desired pulverized particle size, the suction pressure is set low so that the very large particles are not immediately discharged from the discharge port 9. That is, the particles are set so as to frequently collide with the rotor blades 5 and 6, particularly the first rotor blade 5, by staying in the casing 2.
[0032]
Thus, after adjusting the air flow in the casing 2 by changing the operating conditions of the suction device 10 in accordance with the raw material characteristics, the raw material powder is introduced from the inlet 8 and pulverization is started. Then, this raw material powder enters the crushing chamber 7 on the first side casing member 42 side from the opening 47, and then passes through the gap between the blades 69 of the first rotary blade 5 and a part of the charged powder. The particles are circulated around the first rotary blade 5 by riding on the airflow generated by the rotation of the blades 69..., And some particles are drawn to the second rotary blade 6 side. Circulate around the wing 6. Since the circulation orbit of the first rotary blade 5 (that is, the circulating airflow) and the circulation orbit of the second rotary blade 6 in the grinding chamber 7 have mutually opposite velocity components, the particles on the respective circulation orbits collide with each other. It is crushed under shear stress (gas pulverization).
[0033]
Among the charged raw materials, for example, particles that have a large mass and are difficult to ride on the air current collide with the front side surface of the rotating first rotor blade 5 in the rotational direction of the first rotor blade 5 and are crushed. Since the raw material particles colliding with the first rotary blade 5 rotate in the same direction as the first rotary blade 5, they receive centrifugal force, collide with the casing inner peripheral surfaces 21 and 41 (casing inner surface), and are pulverized again. Further, it rebounds and collides with the wings 69 of the first rotary wing 5. The crushing by these collisions is repeated until the particles have a size that can ride on the circulating airflow. When the particles have a size that can ride on the circulating airflow, the process proceeds to gas crushing.
[0034]
Then, some of the particles that have shifted to gas pulverization move toward the second rotary blade 6 by the suction force of the suction device 10, and can easily ride on the circulating airflow generated around the second rotary blade 6. Around the second rotary blade 6, the air current circulates in the space including the gaps 82 a. In the space where the airflow is generated by the rotation of the first rotary blade 5, that is, the space between the first rotary blade 5 and the second rotary blade 6, it is easy for particles to collide with each other due to the airflow. Further, in a space where airflows of different velocities flow in parallel, for example, in the gaps 82a, the airflow velocity gradient is between the rotating second blade inclined surface 76 and the second inclined inner peripheral surface 22. As a result, shear stress is generated in the gas, and friction between particles is likely to occur. Therefore, gas grinding can be promoted.
[0035]
Particles finely pulverized to a desired pulverized particle size, for example, on the order of submicron by gas pulverization have a small mass, and therefore are sucked along the rotation center line of the second rotary blade 6 and discharged from the discharge port 9. It is discharged and collected through a connection channel 62 at a collection unit (not shown).
[0036]
That is, by changing the rotational speed of each of the rotor blades 5 and 6 as appropriate, or by changing the operating conditions of the suction device 10 as appropriate to change the pulverization conditions such as the pulverization time and the state of airflow, Can be adjusted to obtain a desired pulverized particle size. Similarly, the pulverization degree of the raw material can be adjusted by changing the raw material input amount into the pulverizer 1.
[0037]
In the above embodiment, the raw material is supplied from the input port 8 and the raw material is pulverized in a state where the first rotary blade 5 and the second rotary blade 6 are rotated in the same direction while operating the suction device 10. However, the present invention is not limited to this. For example, if the raw material is introduced from the inlet 8 while the rotary blades 5 and 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, it is preferable because the raw material particles further collide with the first rotary blade 5 and easily receive a centrifugal force. Then, after the pulverization due to the collision between the first rotor blade 5 and the raw material particles is performed to some extent, the suction device 10 is operated (that is, if the operation of the suction device 10 is started while the raw material is being crushed). ) The pulverization efficiency can be improved. Even when the rotary blades 5 and 6 are rotated in opposite directions, the pulverization efficiency can be similarly improved.
[0038]
Next, the case where the 1st rotary blade 5 and the 2nd rotary blade 6 are rotated in the opposite rotation direction is demonstrated.
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 the opposite rotational directions, and the suction device 10 is changed to operating conditions according to the raw material characteristics, so that the casing 2 Adjust the airflow inside. When the raw material is charged from the charging port 8, the raw material enters the crushing chamber 7 on the first side casing member 42 side from the opening 47 as in the case of the same rotation direction. After that, it passes through the gap between the blades 69 of the first rotor blade 5 and some of the particles circulate around the first rotor blade 5 on the air flow generated by the rotation of the blades 69. Some particles are drawn toward the second rotor blade 6 and circulate around the second rotor blade 6.
[0039]
Further, in addition to the circulating airflow of the first rotating blade 5 and the circulating airflow of the second rotating blade 6 in the grinding chamber 7 having mutually opposite velocity components, the rotating blades 5 and 6 rotate in opposite directions. Therefore, not only the radial direction but also the rotational direction of each of the rotary blades 5 and 6 has a reverse speed component. Therefore, since a shearing stress larger than that in the same direction is generated, the pulverization efficiency can be improved.
[0040]
After that, as in the case of the same rotation as described above, the pulverized particles whose mass has been reduced are sucked along the rotation axis of the second rotary blade 6 and discharged from the discharge port 9, and the connection flow path 62. And is collected by a collection unit (not shown).
[0041]
In the above embodiment, the spacers 84 and 85 having different cylindrical lengths or the intermediate casing member 43 are selected and attached to the pulverizer 1, the gap G between the rotary blades 5 and 6, the first inclined inner circumference of the casing 2. A gap 81 a between the surface 21 and the first blade inclined surface 75 of the first rotor blade 5, and the second inclined inner peripheral surface 22 of the casing 2 and the second blade inclined inner peripheral surface 76 of the second rotor blade 6. Although the state of the airflow in the crushing chamber 7, that is, the casing 2, is adjusted by changing the gaps 82a, the present invention is not limited to this.
For example, separately preparing a plurality of first rotor blades 5 and second rotor blades 6 with different shape dimensions such as blade diameter and blade width, selecting from these rotor blades and attaching them to the pulverizer 1, By changing the gap G or the gaps 81a, 81b, 82a, 82b, etc., the state of the airflow according to the characteristics of the raw material to be crushed may be adjusted.
This is preferable because the gap between the tip surface of each of the rotor blades 5 and 6 and the cylindrical inner peripheral surface 41 can be adjusted, and the adjustment range of the airflow state is widened.
[0042]
Further, the inclination angles of the inclined inner peripheral surfaces 21 and 22 and the blade inclined surfaces 75... 76 need only be positioned in parallel with each other, and the angle with respect to the rotation axis is shown in the above embodiment. It is not limited to 45 degrees.
[0043]
【The invention's effect】
As described above, the present invention has the following effects.
That is, the raw material of the particles or particle and the casing inner surface or particles and to collide with each rotor blade, the raw material was ground from the middle of pulverizing the raw material to start operation of the suction device in communication with the casing Since the state of the airflow in the casing is adjusted , even if raw material particles that are extremely larger than the desired pulverized particle size are introduced, they stay in the casing and are pulverized. Therefore, the time during which the raw material particles in the casing are pulverized to a desired particle size can be shortened, and thereby the efficiency of gas pulverization can be improved.
[0044]
In addition, since the raw material is pulverized by changing the state of the airflow in the casing by changing the rotational speed of at least one of the first rotary blade or the second rotary blade, the airflow in which the raw material particles easily collide with the casing. It can be made to occur inside, and gas grinding can be performed efficiently.
[0045]
By changing the gap between the tip of at least one of the first rotor blade or the second rotor blade and the inner surface of the casing, and the distance between the first rotor blade and the second rotor blade, the state of the airflow in the casing is changed. Since the raw material is pulverized, the space in the casing serving as the pulverization chamber, that is, the space in which the airflow is generated can be adjusted in accordance with the raw material characteristics to efficiently perform the gas pulverization.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a pulverizer.
FIG. 2 is an enlarged cross-sectional view of a main part of the pulverizer.
FIG. 3 is an enlarged sectional view of an inner peripheral surface of each casing member and each blade.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Crusher 2 Casing 3 Motor 4 Motor 5 1st rotary blade 6 2nd rotary blade 7 Crushing chamber 8 Input port 9 Discharge port 10 Suction device 21 First inclined inner peripheral surface 22 Second inclined inner peripheral surface 23 First bearing 24 First support shaft 25 Seal ring 26 Extending cylinder inner peripheral portion 27 Second bearing 28 Second support shaft 29 Seal ring 41 Cylindrical inner peripheral surface 42 First side casing member 43 Intermediate casing member 44 Second side casing member 46 Convex part 47 Opening part (Inlet communication opening)
51 Slide base 52 Base 53 Rail 55 Ball screw 56 Motor 58 Recess 59 Recess 61 Opening (discharge opening communication opening)
62 Connection flow path 64 Convex part 68 Boss 69 Blade 70 Boss 71 Blade 75 First blade inclined surface 76 Second blade inclined surface 77 Tip surface 78 Tip surfaces 81a, 81b Gap 82a, 82b Gap 84 Spacer 85 Spacer 86 Rotor blade mounting part 87 Rotary blade mounting part G Spacing between both rotary blades

Claims (4)

The raw material is supplied from the first rotary blade side into a casing provided with the first rotary blade and the second rotary blade provided with a plurality of blades facing each other, and the raw material is placed on the airflow generated by the rotation of both rotary blades. ,
The raw material particles moving on this airflow, or the particles and the casing inner surface, or the particles and each rotor blade collide to pulverize the raw materials ,
A raw material pulverization method for powders, granules, etc., characterized in that the operation of a suction device communicating with the casing is started in the middle of pulverizing the raw material to adjust the state of the airflow in the casing . The powder according to claim 1, wherein the state of the airflow in the casing is adjusted by changing the gap between the tip of at least one of the first rotary blade or the second rotary blade and the inner surface of the casing. Raw material pulverization method for granules and the like. 3. The powder, granule, etc. according to claim 1, wherein the state of the airflow in the casing is adjusted by changing the distance between the first rotor blade and the second rotor blade facing each other. Raw material grinding method. The casing is divided into a first side casing member on the first rotor blade side, a second side casing member on the second rotor blade side, and an intermediate casing member for connecting both side casing members, and the first rotor blade is configured. And at least one of the first side casing member or the second rotor blade and the second side casing member is movable in the axial direction,
  2. The state of the airflow in the casing is adjusted by replacing the intermediate casing member with one having a different width and changing the distance between the first rotary blade and the second rotary blade facing each other. The raw material grinding | pulverization method of the powder in any one of Claim 3 or a granular material.

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