JPH1128380A - Crusher - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a crusher wherein a powdery raw material is hardly fused between a crusher blade and grooves of a liner. SOLUTION: This crusher comprises a rotary board 3 capable of being rotatively driven about a rotation axis Z and a liner 4 disposed concentrically with respect to the rotation axis so as to surround an outer circumference of the rotary board 3, and a large number of crusher blades A are provided on an outer peripheral part of one side face 3a of the rotary board 3 in spaced relation with each other in a circumferential direction in such a manner as to form a space 6 against the liner 4, and a powdery raw material 7 and air 8 are made to pass through the space 6 between the crusher blades A and the liner 4 from another side face 3b side of the rotary board 3 to the one side face 3a side so as to crush the raw material 7. A plurality of grooves, which guides the powdery raw material 7a and the air 8 to a downstream side of the rotary board 3 in a rotation direction of the board 3 when the powdery raw material 7 and air 8 are made to pass through from the other face side 3b side to the one face side 3a side, are provided in an inner circumferential face of the liner 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary disk which can be driven and rotated about a rotary shaft, and a liner coaxial with the rotary disk and surrounding the outer periphery of the rotary disk. In the state where there is a gap between the crushing blade, a number of crushing blades are arranged side by side at an interval in the circumferential direction on the outer peripheral portion of one surface of the rotary disc, and the raw material powder and air are mixed with the crushing blade. The present invention relates to a crusher that crushes the raw material powder by passing the rotary disk from the other surface side to the one surface side through a gap with the liner.

[0002]

2. Description of the Related Art In a conventional crusher, the crushing blade,
Further, the groove of the liner is configured so as to extend in the up-down direction equal to the extending direction of the rotation axis. In a conventional pulverizer, the raw material powder to be pulverized is passed from the lower side to the upper side between the pulverizing blade and the liner, and is pulverized by repeating collision between the two members.

[0003]

As described above, the frequency of powder coming and going between the crushing blade and the liner and colliding for crushing is high. Thereafter, the raw material powder is impact-pulverized by the crushing blade and collides substantially perpendicularly with the groove of the liner. However, when the raw material powder is relatively soft, the powder is crushed by the groove. In some cases, it was hit on the surface and the impact caused it to become hot and fused.
As a result, not only the function of the groove is impaired, but also the passage of the raw material powder itself becomes impossible in some cases because the groove is closed. Further, when the groove is closed, the flow of the air is hindered, the pressure loss of the air in the crusher increases, and when the capacity of the blower is small, the air stagnates. This promotes the high temperature of the crushing blade and the groove, and makes the raw material powder more easily fused. Further, when the raw material powder is fused to the groove or the like, the power loss for rotating the rotating disk increases,
There have been inconveniences such as the necessity of providing the drive device with an extra drive force.

[0004] It is an object of the present invention to provide a pulverizer in which the above-mentioned drawbacks of the prior art are eliminated and the raw material powder is less likely to be fused to the pulverizing blade and the groove of the liner.

[0005]

The features of the present invention for achieving this object will be described with reference to the examples shown in FIGS.

(Structure 1) In the pulverizer of the present invention, the raw material powder 7 and the air 8 are supplied to the turntable 3 as described in claim 1.
A plurality of grooves 5 that are guided to the lower side in the rotation direction of the turntable 3 when passing from the other surface 3b side to the one surface 3a side.
Is formed on the inner peripheral surface of the liner 4. (Operation / Effect) Usually, the raw material powder is ejected outward in the plane of rotation of the rotating disk by the rotating crushing blade. However, since the groove is inclined to the lower side in the rotation direction, the raw material powder colliding with the collision surface forming the groove rebounds upward with respect to the incident direction. As described above, when the collision direction and the repulsion direction of the raw material powder are different, the impact force applied to the raw material powder is reduced, and the amount of heat generated by the impact is also reduced. That is, it is possible to reduce the frequency of crushing and fusion of the raw material powder at the collision surface while applying an impact force to crush the raw material powder to the raw material powder. Therefore, clogging of the groove is suppressed. When the clogging of the groove is suppressed, the power loss for rotating the turntable is also reduced. For this reason, it is not necessary to provide an extra driving force to the driving device, and the crusher can be made compact. When attention is paid to the flow of air in each groove, the air in the groove moves upward so as to be squeezed out by the crushing blade with the rotation of the crushing blade. That is, since the crushing blade actively flows the air upward, the flow of the air supplied from the air supply space is hardly obstructed. If the smooth flow of the air is maintained, the cooling effect of the crushing blade and the liner can be expected. As described above, the pulverizer of the present configuration exerts a stable pulverizing function over a long period of time particularly when pulverizing a soft and low-melting raw material powder.

(Structure 2) In the pulverizer according to the present invention, the plurality of grooves 5 can be formed from the lower end surface 4b to the upper end surface 4a of the liner 4. (Operation / Effect) As in the present configuration, by connecting the groove portion from the lower end surface to the upper end surface of the liner, the internal space of the groove portion can be formed substantially linearly. As a result, it is possible to reduce the resistance when the raw material powder and the like flow between the crushing blade and the liner, and to smoothly discharge the raw material powder and the like from between the crushing blade and the liner.
The stagnation of the raw material powder and the like in the groove can be prevented, and the operation and effect of the above configuration 1 can be further improved.

(Structure 3) As described in claim 3, the crusher of the present invention is located on the lower side of the lower end surface 4b and the upper end surface 4a through which the raw material powder 7 and the air 8 pass. The depth d2 and the width w2 of the groove 5 near the end face can be configured to be larger than the depth d1 and the width w1 of the groove 5 at the center in the longitudinal direction of the groove 5. (Operation / Effect) As in this configuration, the depth and width of the groove portion on the side from which the raw material powder and the like are discharged are increased, so that the raw material powder and the like between the grinding blade and the liner are easily discharged. Thus, the number of times the raw material powder is struck by the crushing blade and the liner is slightly reduced to reduce the impact force applied to the raw material powder.

(Structure 4) In the crusher of the present invention, as described in claim 4, the inclination angle β of the groove 5 when the liner 4 is viewed from the radial direction Y of the rotation axis Z of the rotating disk 3. 1
It can be configured from 0 to 60 degrees. (Operation / Effect) The effect of pulverizing the raw material powder without fusing it to the groove and the like described in the configuration 1 and the effect of smoothly flowing the raw material powder and the like inside the groove are in a contradictory relationship. That is, when the inclination of the groove is excessive, the impact force applied to the raw material powder is reduced, but the effect of pushing up the air inside each groove is increased, and the flow of the raw material powder and the like becomes smooth. Conversely, if the inclination of the groove is too small, the impact force applied to the raw material powder increases, but the effect of pushing up the air inside the groove decreases,
The flow of the raw material powder etc. stagnates. However, the appropriate inclination angle of the groove needs to be slightly changed depending on the material characteristics of the raw material powder to be pulverized. As in this configuration, the inclination angle is set to 1
By appropriately selecting within the range of 0 to 60 degrees, various kinds of raw material powders can be finely pulverized.

(Structure 5) The crusher according to the present invention has a crushing chamber 2 and a classifying rotor 9 for taking out the crushed powder in the crushing chamber 2 as described in claim 5. Can be provided. (Operation / Effect) With this configuration, only the powder pulverized to a required size or the like can be taken out. In the pulverizer of the present invention, the groove of the liner is inclined to mainly reduce the impact when the raw material powder collides with the groove, thereby preventing the fusion of the powder to the groove and the like. That is, in the pulverizer of the present invention, since the pulverizing effect when the raw material powder passes through the groove once is reduced, in order to pulverize the raw material powder to a predetermined size, the number of times of passing through the groove is required. Need to be increased. If a classifying rotor is provided as in this configuration, the unmilled powder can be kept inside the grinding chamber, and the number of passages is inevitably increased to reliably mill the raw material powder. be able to.

In the description of the means for solving the above problems, reference is made to the drawings and, in order to facilitate comparison with the drawings, the reference numerals are used, but the invention is limited to the configuration shown in the accompanying drawings. Not something.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

(Outline) As shown in FIG. 1, the crusher of the present invention has a crushing chamber 2 inside a casing 1 and a rotary disk 3 arranged below the crushing chamber 2. The rotary disk 3 can be driven and rotated about a vertical axis Z at a center position of the pulverizing chamber 2. A plurality of crushing blades A are provided on an outer peripheral portion of the one surface 3a of the rotating disk 3 along a circumferential direction of the outer peripheral portion. In this case, the one surface 3a refers to the upper surface of the turntable 3. The casing 1
A liner 4 is provided at a position on the inner peripheral wall facing the crushing blade A. A plurality of grooves 5 are formed on the inner surface of the liner 4. A gap 6 having a predetermined interval is provided between the liner 4 and the crushing blade A. That is, the raw material powder 7 and the air 8 are circulated between the crushing blade A and the liner 4, and the collision and repulsion of the raw material powder 7 are repeatedly performed between the crushing blade A and the liner 4. The super fine powder is manufactured by using. In the center of the pulverizing chamber 2, a classification rotor 9 for separating and discharging only the finely pulverized fine powder is provided. The inside of the classifying rotor 9 is connected to a collecting device 10 and a suction device 10a separately provided outside the crushing chamber 2,
The air 8 in the crushing chamber 2 is sucked from between the rotor blades 9a. By appropriately adjusting the degree of suction or the rotation speed of the classification rotor 9, only fine powder having a predetermined particle size or less can be separated and discharged. If the classifying rotor 9 is provided, the unground material powder 7 circulates inside the grinding chamber 2 many times, and the material powder 7 can be reliably ground to a predetermined size. it can.

The raw material powder 7 and the air 8 with respect to the grinding chamber 2
Is supplied as follows. The raw material powder 7 is fed from a raw material inlet 11 provided at a position above the crushing blade A in the peripheral wall of the casing 1. Input is performed using a feeder or the like, and air 8 is supplied from the raw material input port 11 as well. The raw material powder 7 is supplied while being mixed with the air 8. On the other hand, air 8 is also supplied from the lower side of the turntable 3. A donut-shaped air supply space 12 is provided in a space below the turntable 3. An air supply port 13 is provided in the peripheral wall of the casing 1 forming the air supply space 12, and a predetermined amount of air 8 is supplied from the air supply port 13. The air 8 is supplied using a blower 14 after removing impurities and the like with a filter F, for example. The air 8 is
Immediately before the air is supplied to the air supply space 12, the cooling device C cools the air to a predetermined temperature. The air 8 supplied to the air supply space 12 flows in the outer peripheral direction of the rotating disk 3 along the other surface 3b of the rotating disk 3 and passes through the gap 6 between the crushing blade A and the liner 4 from below. And reaches the inside of the crushing chamber 2.
The other surface 3b in this case refers to the lower surface of the turntable 3. The air 8 supplied to the air supply port 13 is appropriately cooled to a predetermined temperature. Thereby, the crushing blade A and the liner 4
The heat generated from the raw material powder 7 to be pulverized is absorbed, and the temperature rise of the pulverizing blade A and the liner 4 is suppressed. As a result, the crushing blade A
In this way, the fusion of the raw material powder 7 can be prevented. Of course, the raw material powder 7 to be charged may be cooled.

(Pulverizing Blade) The crushing blades A provided on the outer peripheral portion of the rotary disk 3 at equal intervals in the circumferential direction X are, as shown in FIG. 2, a lower crushing blade A1 and an upper crushing blade A2. Consists of

<Lower Crushing Blade> The lower crushing blade A1 comprises an annular lower crushing blade main body 15 and an annular top plate 16, as shown in FIG. A number of lower crushing blade pieces 15a are formed on the outer peripheral portion of the lower crushing blade main body 15. Each of the lower crushing blade pieces 15a is a substantially rectangular plate member, and its plate surface is set upright in a state including a rotation axis Z of the rotating disk 3 in a plane. The gap between the lower crushing blade pieces 15a is
In order to allow the raw material powder 7 and the circulating air 8 to smoothly pass through the gap, the rotation is substantially parallel to the rotation axis Z when viewed in the same direction (hereinafter, referred to as “planar direction”).
That is, the thickness of one lower crushing blade piece 15a is equal to the rotation axis Z.
The side is formed thinner. The annular top plate 16 attached to the upper end of the lower crushing blade piece 15a forms a tunnel-shaped space between two adjacent lower crushing blade pieces 15a,
As described later, the raw material powder 7 and the air 8 are guided between the crushing blade A and the liner 4.

<Upper grinding blade> Upper surface 16a of the top plate 16
The upper crushing blade A2 having the shape shown in FIG. The upper crushing blade A2 includes an upper crushing blade main body 17 and an upper crushing blade piece 17a. A plurality of upper crushing blade pieces 17 a are provided along the circumferential direction X on the outer peripheral portion of the upper crushing blade main body 17. The number of the upper crushing blade pieces 17a is, in principle, the same as the number of the lower crushing blade pieces 15a or larger than the lower crushing blade piece 15a. The upper crushing blade A2 is superimposed on the lower crushing blade A1, and the upper crushing blade A2 and the lower crushing blade A1 are connected using screws or the like.

(Groove of Liner) As shown in FIG. 2 and FIG.
It is configured to have a large number of trapezoidal projections on its inner surface. For this reason, when the inner surface of the liner 4 is viewed from the radial direction Y of the rotation axis Z, the plurality of groove portions 5 can be seen.
The groove 5 functions as a collision surface for crushing the raw material powder 7 when the raw material powder 7 passes through the gap 6 between the crushing blade A and the liner 4. 7 functions as a guiding portion when passing through the gap 6.
In other words, the raw material powder 7 supplied to the gap 6 repeatedly reflects and collides between the respective surfaces constituting the groove 5,
It passes through the gap 6.

As shown in FIG. 3, one groove 5 has
For example, it is composed of a first surface F1, a second surface F2, and a third surface F3. In a plan view, the first surface F1 is inclined at a predetermined angle toward the upper side in the rotation direction of the turntable 3 with respect to the radial direction Y of the rotation axis Z. The second surface F2 is inclined by a predetermined angle α from the depth of the groove 5 to the lower side in the rotation direction of the turntable 3 with respect to the first surface F1. According to this configuration, the raw material powder 7 hit by the crushing blade A collides at an angle close to a right angle in a plan view, so that a high crushing effect can be obtained. In addition, a part of the raw material powder 7 that has collided and repelled on the second surface F2 subsequently collides with the first surface F1, so that a higher pulverizing effect can be exhibited. A portion where the first surface F1 and the second surface F2 intersect,
That is, the bottom of the groove 5 is formed in a curved shape as shown in FIG. With this configuration, it is possible to form an air flow along the surface of the bottom portion, and it is possible to prevent stagnation or accumulation of the powder at the bottom portion. The first surface F
A third surface F3 is formed at a position on the inner peripheral side of the liner 4 in a portion where the first surface 1 and the second surface F2 intersect. The third surface F3 is configured as, for example, a substantially cylindrical surface around the rotation axis Z. By providing the third surface F3, fluctuations in the capacity of the crusher due to use are reduced.
That is, if the intersection of the first surface F1 and the second surface F2 is formed in an edge shape, the edge portion is worn by the collision of the raw material powder 7 as a result of long-time use. . As a result, the inner diameter of the liner 4 increases,
The gap 6 between the liner 4 and the liner 4 is enlarged. However, as described above, if the third surface F3 is formed from the beginning, the expansion of the gap 6 is suppressed, and the crushing ability of the crusher can be maintained constant for a long time.

As shown in FIG. 4, the groove 5 according to the present invention
Along the direction in which the raw material powder 7 and the air 8 pass,
The turntable 3 is inclined downward in the rotation direction. That is, when the groove 5 is viewed from the radial direction Y of the rotation axis Z, the rotation axis Z and the groove are inclined by a predetermined angle β. According to this configuration, the raw material powder 7 passing through the gap 6 is blown up while spirally moving in the same direction as the rotating disk 3. The length of the groove 5 in the up-down direction is formed to be longer than the length of the crushing blade A in the up-down direction, and from below the lower end of the crushing blade A to the upper end of the crushing blade A. Are also arranged so as to extend toward the upper side. With this configuration, the entire length of the crushing blade A can be effectively used. Further, the groove 5 is provided over the entire width in the height direction of the liner 4 from the upper end surface to the lower end surface of the liner 4. With this configuration, as described below,
The raw material powder 7 and the air 8 pass through the groove 5 smoothly without changing the flowing direction of the raw material powder 7 and the air 8 flowing through the groove 5.

(Other Configurations) As shown in FIG. 1, a water cooling jacket 18 for cooling is provided on the outer peripheral portion of the crushing chamber 2. Thereby, the inside of the crushing chamber 2 and the liner 4 are cooled to absorb the heat generated by the crushing of the raw material powder 7, so that the fusion of the raw material powder 7 to the groove 5 is more effectively suppressed. be able to. The rotating disk 3 is driven and rotated by a driving device (not shown) via a pulley 19 provided below the pulverizer. On the other hand, the classification rotor 9
Is driven and rotated by a driving device (not shown) via a pulley 20 provided above the pulverizer. An air seal 21 is provided between the classifying rotor 9 and the casing 1. The air seal 21 prevents unmilled raw material powder from flowing into the classifying discharge path from the gap between the casing 1 and the classifying rotor 9.

(Circulation of Raw Material Powder / Air and Grinding of Raw Material Powder) Inside the crushing chamber 2, air 8
Rises along the inner surface of the peripheral wall portion 1a, and descends again near the upper surface 3a of the turntable 3 via the ceiling portion 1b and the outer peripheral portion of the classifying rotor 9 provided at the center of the crushing chamber 2. The air 8 and the raw material powder 7 that have descended to the vicinity of the upper surface 3a of the turntable 3 circulate to the outer peripheral side of the turntable 3 along the upper surface 3a of the turntable 3,
After passing between the lower crushing blade pieces 15a, the crushing blade A
And the liner 4 is supplied to the gap 6. As a result, collision grinding is performed between the grinding blade A and the liner 4. When the raw material powder 7 and the like are supplied between the crushing blade A and the liner 4, the top plate 16 functions effectively. That is, a tunnel is formed at the outer peripheral portion of the lower crushing blade A1 by the adjacent lower crushing blade piece 15a and the top plate 16, so that the raw material powder 7 and the air 8 circulating in the space are reliably formed. Is guided to the gap 6.

Air 8 is blown up and supplied from the air supply space 12 to the gap 6, and the raw material powder 7 guided to the gap 6 is guided upward by the air 8 from below. . When the raw material powder 7 spirally rises,
Pulverization is performed by reciprocating reflection and reciprocation between the opposing first surface F1 and second surface F2 many times, but as a result of the groove 5 being inclined downward in the rotation direction, the first surface F1 and the second surface F2 are crushed. Surface F
The raw material powder 7 colliding with 2 rebounds upward with respect to the incident direction. If the collision direction and the repulsion direction of the raw material powder 7 are different from each other, the impact force applied to the raw material powder 7 is reduced. That is, an impact force that can surely pulverize the raw material powder 7 is generated while the raw material powder 7 is not crushed completely. As a result, the frequency of crushing of the raw material powder 7 due to excessive impact on the first surface F1 and the second surface F2 is reduced, and the heat generated by the crushing is also reduced. Therefore, the raw material powder 7 is applied to the first surface F1 and the second surface F2.
Is prevented, and clogging of the groove 5 can be suppressed.

The following effects can also be expected by forming the groove 5 in a spiral shape. That is, paying attention to the flow of the air 8 in each groove 5, the air 8 moves upward so as to be squeezed out by the crushing blade A with the rotation of the crushing blade A. As described above, the crushing blade A actively flows the air 8 upward, so that the air supply space 12
The flow of the air 8 supplied from the air becomes difficult to be hindered.

Further, with respect to the point that the flow of the air 8 is not hindered, the following configuration is considered to also contribute effectively. That is, the groove 5 of the present invention is formed over the entire width in the height direction of the liner 4 from the lower end face 4b to the upper end face 4a of the liner 4 so as to extend the space inside the groove 5 as linearly as possible. It is. With this configuration, it is possible to reduce the resistance when the raw material powder 7 flows into the space between the crushing blade A and the liner 4, and discharge the raw material powder 7 from the crushing blade A and the liner 4. Can be performed smoothly.

Another effect is that, by inclining the groove 5, the raw material powder 7 colliding with the second surface F 2 and the like repels upward, so that the air 8 supplied from the air supply space 12 causes The resistance when passing through 6 is reduced. If the flow rate of the air 8 in the gap 6 can be maintained, the cooling effect of the air 8 on the crushing blade A and the liner 4 can be expected.
In this case, the required capacity and the like of the blower 14 for supplying the air 8 can be reduced, and the pulverizer can be made compact.

(Example) In the following, an example in which a toner having a bulk density of 0.5 g / cc through a 2 mm sieve is pulverized will be described. The outer diameter of the crushing blade A was set to 400 mm, the number of the crushing blades A was set to about 150, and the gap between adjacent crushing blades A was set to about 5 mm. The cross-sectional shape of the outer peripheral end of the crushing blade A in a plan view is rectangular. The shape of the groove 5 of the liner 4 was such that the angle α between the first surface F1 and the second surface F2 was 40 degrees, and the depth of the first surface F1 in the radial direction Y of the rotation axis Z was 3 mm. Further, when viewed in the radial direction of the rotation axis Z,
The inclination angle β of the groove 5 was 30 degrees with respect to the rotation axis Z. The inclination angle β can be appropriately changed within the range of 10 to 60 degrees, but when set to 30 to 40 degrees, the degree of fusion of the raw material powder 7 is the smallest. The gap 6, that is, the distance between the third surface F3 of the liner 4 and the crushing blade A is about 1 m.
m. Upper grinding blade A2, lower grinding blade A1, liner 4
Were made of stainless steel. The driving device for the rotating disk 3 used had an output of 22 kW. Since the driving load required for idling at no load was about 6 kW, an output of 16 kW could be used to pulverize the raw material powder 7. The rotation speed of the rotating disk 3 was about 7,000 rpm, and the peripheral speed of the rotating disk 3 was about 150 m / sec. 5 m ³ / min air 8 from raw material inlet 11
While air 8 at −7 ° C. was supplied from the air supply space 12 at 15 m ³ / min. Classification rotor 9
Was set at 20 m ³ / min. At the time of steady operation, the airflow temperature at the raw material inlet 11 can be maintained at -5 ° C, and the airflow temperature at the outlet of the classification rotor 9 can be maintained at 28 to 30 ° C. 5
No fusion of the raw material powder 7 was observed. The average particle size of the pulverized product under the above operating conditions is about 5 μm, and the pulverization processing capacity of the raw material powder 7 is about 20 kg / h.
Met.

[Another Embodiment] <1> In the above embodiment, an example in which the depth and the width of the groove 5 are substantially constant has been described. However, the present invention is not limited to this configuration, and the following configuration is also possible. . That is, as shown in FIG. 5, the depth d2 and the width w2 of the groove 5 near the upper end surface 4a, which is the end surface located on the lower side through which the raw material powder 7 and the air 8 pass, are defined by the groove 5 D1 and width w1 of the groove 5 at the center in the longitudinal direction
It is deeper and wider. With this configuration,
The raw material powder 7 and the like between the crushing blade A and the liner 4 are easily discharged, and the number of times the raw material powder 7 is hit by the crushing blade A and the liner 4 is slightly reduced, so that the impact applied to the raw material powder 7 The effect of suppressing fusion due to pulverization, such as relaxing the force, is produced. FIG. 5 shows the raw material powder 7 and the air 8.
In the vicinity of the lower end surface 4b on the side where
An example is shown in which the depth d3 and the width w3 of the groove 5 are configured to be deeper and wider than the depth d1 and the width w1 of the groove 5 in the central portion. With this configuration, the supply amount of the raw material powder 7 and the like to the groove 5 can be increased, so that the pulverizing ability of the pulverizer is improved.

<2> In the above embodiment, the groove 5
Has a substantially saw blade shape, but is not limited to this configuration. For example, the other cross-sectional shape may be a substantially rectangular shape as shown in FIG. 6 or a substantially cylindrical shape as shown in FIG. In short, any shape may be used as long as the raw material powder 7 and the air 8 can smoothly rise inside the groove 5 and the raw material powder 7 can collide and pulverize on the surface constituting the groove 5. There may be.

[Brief description of the drawings]

FIG. 1 is a sectional view of a crusher.

FIG. 2 is an explanatory view showing an external shape of a crushing blade and a groove.

FIG. 3 is a cross-sectional view showing details of a crushing blade and a groove portion.

FIG. 4 is an explanatory view showing the inclination of a groove.

FIG. 5 is an explanatory view showing a shape of a groove according to another embodiment.

FIG. 6 is an explanatory view showing a shape of a groove according to another embodiment.

FIG. 7 is an explanatory view showing a shape of a groove according to another embodiment.

[Explanation of symbols]

 Reference Signs List 3 rotating disk 3a one surface of rotating disk 3b other surface of rotating disk 4 liner 4b lower end surface 4a upper end surface 5 groove 6 gap between groove and crushing blade 7 raw powder 8 air d1, d2 depth of groove w1, w2 groove Width β Slope angle of groove A crushing blade Z axis of rotation

Claims (5)

[Claims] 1. A rotating disk that can be driven and rotated about a rotating shaft center, and a liner coaxial with the rotating disk and surrounding an outer peripheral portion of the rotating disk, wherein a gap is formed between the liner and the liner. In the existing state, a number of crushing blades are arranged side by side at an interval in a circumferential direction on an outer peripheral portion of one surface of the rotating disk, and raw material powder and air are passed through the gap between the crushing blade and the liner. A pulverizer that pulverizes the raw material powder by passing the other side of the turntable from the other side to the one side, and passing the raw material powder and air from the other side to the one side. A pulverizer in which a plurality of grooves for guiding the raw material powder and air to the lower side in the rotation direction of the rotating disk at the time of the formation are formed on the inner peripheral surface of the liner. 2. The crusher according to claim 1, wherein the plurality of grooves are formed from a lower end surface to an upper end surface of the liner. 3. A depth and a width of the groove in the vicinity of an end surface located on a lower side through which the raw material powder and the air pass, of the lower end surface and the upper end surface, wherein a depth and a width of the groove in a longitudinal central portion of the groove are different. The crusher according to claim 1, wherein the crusher is configured to be larger than a depth and a width of the groove. 4. The crusher according to claim 1, wherein the groove has an inclination angle of 10 to 60 degrees when the liner is viewed from a radial direction of the rotation axis. 5. The crusher has a crushing chamber,
The crusher according to any one of claims 1 to 4, further comprising a classifying rotor for taking out the crushed powder inside the crushing chamber.