Pulverizing apparatus

Abstract

To provide an external circulation-type pulverizing apparatus, which is configured so that no inconvenience occurs.SOLUTION: A pulverizing apparatus according to the present invention is provided with: a pulverizing container in which a pulverizing chamber is provided; a jet machine that jets an object to be pulverized in the pulverizing chamber and pulverizing media; a colliding body arranged at a front side in a jetting direction of the object to be pulverized and the pulverizing media by the jet machine; a stirrer that stirs the object to be pulverized in the pulverizing chamber and the pulverizing media; and an inductor that inducts the object to be pulverized rising in the pulverizing container and the pulverizing media to the jet machine.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a grinding device using grinding media. [Background technology]

[0002] There are two types of grinding equipment: one that uses shear force and one that uses impact force. Known types that use shear force include ball mills, vibration mills, planetary ball mills, and bead mills, while known types that use impact force include jet mills.

[0003] A known conventional crushing device includes a rotor having an internal passage extending to an opening on the outer circumferential surface of the rotor, capable of accommodating the object to be crushed and the crushing medium in the passage, and a crushing vessel having an internal opposing surface that faces the opening of the rotor and extends in an annular shape around the central axis and accommodates the rotor. This crushing device is configured so that the crushing medium and the object to be crushed can be moved from the passage to the accommodation space through the opening by rotating the rotor (see Abstract of Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2021-171673 A Summary of the Invention [Problem to be solved by the invention]

[0005] The pulverizer of Patent Document 1 uses a coanda nozzle that amplifies the gas flow rate by utilizing the Coanda effect, and it is necessary to bleed air to stabilize this function. At this time, a filter is provided at the air bleed point, but when the air is bled, fine particles that are actually necessary may leak from the filter together with the air, making it impossible to maintain the appropriate composition inside the pulverizer.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a crushing device that does not suffer from the above-mentioned disadvantages of external circulation type crushing devices. [Means for solving the problem]

[0007] The grinding device of the present invention is a grinding device that uses grinding media and is equipped with a grinding vessel with a grinding chamber inside, an injector that injects the material to be ground and the grinding media in the grinding chamber, a collision body arranged ahead of the direction in which the material to be ground and the grinding media are injected by the injector, an agitator that agitates the material to be ground and the grinding media in the grinding chamber, and a guide that guides the material to be ground and the grinding media that have risen in the grinding vessel to the injector.

[0008] In the crushing device of the present invention, the injector may be equipped with an injection rotor and an injector drive source for rotating the injection rotor, and the injection rotor may be equipped with an injection port for injecting the material to be crushed and the crushing media.

[0009] In the crushing device of the present invention, the injection rotor may be provided with an intake port for taking in the object to be crushed and the crushing media guided by the induction device into the injection rotor.

[0010] In the pulverizing device of the present invention, two or more injection ports may be provided at intervals in the rotational direction of the injection rotor.

[0011] In the crushing device of the present invention, a passage through which the object to be crushed and the crushing media can move can be provided between the inner wall of the crushing container and the impactor.

[0012] In the crushing device of the present invention, the collision body may be annular, and the inner surface of the collision body may be provided with a collision surface against which the object to be crushed and the crushing media collide.

[0013] In the grinding apparatus of the present invention, the agitator may be one including an agitator rotor and an agitator drive source for rotating the agitator rotor.

[0014] In the grinding device of the present invention, the bottom surface of the stirrer may be provided with a through hole penetrating the bottom surface in the thickness direction.

[0015] In the grinding device of the present invention, a spacer is provided, the injector is provided with an injection rotor and an injector drive source for rotating the injection rotor, the agitator is provided with an agitator rotor and an agitator drive source for rotating the agitator rotor, the agitator rotor is disposed below the injection rotor, and a gap is secured between the injection rotor and the agitator rotor by the spacer. Effect of the Invention

[0016] In the pulverizing apparatus of the present invention, since there is no need for air bleeding, the inconveniences that occur in conventional external circulation type pulverizing apparatuses (the leakage of fine particles that accompanies air bleeding and the associated problems) are unlikely to occur. [Brief description of the drawings]

[0017] [Figure 1] FIG. 2 is a cross-sectional view showing an example of a crushing device of the present invention. [Diagram 2] FIG. 4 is an explanatory diagram of power transmission by an injector drive motor and an agitator drive motor. [Diagram 3] FIG. 2 is an explanatory diagram showing an example of an internal structure of an injector. [Figure 4] FIG. 2 is an explanatory diagram showing an example of a stirrer. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0018] (Embodiment) An example of an embodiment of the present invention will be described with reference to the drawings. The grinding device of this embodiment is a so-called dry bead mill that uses grinding media Y.

[0019] <Overall composition> The grinding device of this embodiment mainly comprises a grinding container 10, an injector 20, a collision body 30, an agitator 40, and an induction body 50. The injector 20, the collision body 30, the agitator 40, and the induction body 50 are arranged in the grinding container 10 and fixed to a frame 60 arranged below the grinding container 10.

[0020] <Crushing container> The grinding container 10 accommodates the object to be ground X and grinding media Y, and is provided with a grinding chamber 11 therein. As an example, the grinding container 10 shown in Fig. 1 is entirely dome-shaped (spherical), and includes an upper member 12 with a semi-spherical round roof and a cylindrical lower member 13.

[0021] The grinding container 10 can be made of various materials, but from the viewpoint of preventing metal contamination, it is preferable to use a material other than metal, such as ceramics.

[0022] The upper member 12 is a hollow hemispherical member, and has an upper opening 12a on its upper side and a lower opening 12b on its lower side. The upper opening 12a of the upper member 12 is used as an inlet for the object to be crushed X and the crushing media Y, and also as an inspection port for internal inspection. By making the upper member 12 hemispherical, the object to be crushed X and the crushing media Y can easily rise up inside the crushing container 10.

[0023] The upper periphery of a guide 50 (described later) is connected to the periphery of the upper opening 12a of the upper member 12. The upper member 12 is provided on the periphery of its lower end with an annular upper member lower flange 12c that protrudes outward.

[0024] An outwardly protruding annular upper flange 12d is provided around the periphery of the upper opening 12a of the upper member 12. The upper opening 12a of the upper member 12 is sealed by an upper lid 14. The upper lid 14 of this embodiment has a disk portion 14a and a lower protruding portion 14b that protrudes downward from the bottom side of the disk portion 14a.

[0025] The lower protrusion 14b of the top cover 14 is a portion that fits into the upper opening 12a of the top member 12 to close the upper opening 12a. When the lower protrusion 14b of the top cover 14 is fitted into the upper opening 12a, the portion near the peripheral edge of the disk portion 14a of the top cover 14 overlaps with the upper flange 12d of the top member, and this overlapping portion is fixed with a fastener (e.g., a bolt and a nut, etc.), thereby fixing the top cover 14 to the top member 12.

[0026] The lower member 13 is cylindrical and slightly bulges outward, with an upper end opening 13a at its upper end and a lower end opening 13b at its lower end. An annular lower member upper flange 13c that protrudes outward is provided on the periphery of the upper end opening 13a.

[0027] The grinding container 10 is formed by stacking the upper member lower flange 12c and the lower member upper flange 13c, and connecting the stacked upper member lower flange 12c and lower member upper flange 13c with fasteners (e.g., bolts and nuts, etc.), thereby forming a dome-shaped container with curved surfaces on both the inner and outer surfaces.

[0028] The shape of the grinding container 10 can be a shape other than a dome shape, but by making the inner surface of the grinding container 10 curved, the grinding object X and the grinding media Y inside the grinding container 10 can easily move along the curved surface, which is advantageous in that the grinding object X and the grinding media Y can be easily collected by the guide 50.

[0029] The grinding container 10 thus configured is fixed to a lower base 15. The lower base 15 is a flat plate having an area larger than the lower end opening 13b of the lower member 13, and a discharge pipe 16 for discharging the grinding object X and grinding media Y in the grinding chamber 11 is provided in a part of the lower base 15. The discharge pipe 16 is also used to discharge wastewater generated when the grinding container 10 is cleaned.

[0030] <Injector> The injector 20 is a member that injects the object to be ground X and the grinding media Y in the grinding chamber 11. As shown in Fig. 2, the injector 20 of this embodiment includes an injection rotor (hereinafter referred to as "injection rotor") 21, a main shaft 22 fixed to the injection rotor 21, and an injector drive motor M1 (injector drive source) that rotates the main shaft 22 and the injection rotor 21.

[0031] 1 shows an example of an injection rotor 21 having a main body 21a and a cover 21b. The main body 21a of the injection rotor 21 is a thin, disk-shaped member having a recessed storage space 21c therein for storing the object to be crushed X and the crushing media Y.

[0032] As shown in FIG. 3, the storage space 21c in this embodiment has a cross shape in a plan view and four flow paths 21d extending circumferentially from the center, and an ejection port 21e is provided at the tip of each flow path 21d for ejecting the object to be ground X and grinding media Y in the storage space 21c to the outside (outside the storage space 21c).

[0033] The number of flow paths 21d forming the storage space 21c described here and the number of injection ports formed at the tip of each flow path 21d are just an example, and the number of flow paths 21d and injection ports 21e may be more or less than four.

[0034] A main shaft insertion hole 21f is provided at the center of the main body 21a. A main shaft 22 rotated by an injector drive motor M1 is inserted from below into the main shaft insertion hole 21f. A washer 21g and a nut 21h are attached to a portion of the main shaft 22 that protrudes above the upper end of the main shaft insertion hole 21f, and the main shaft 22 is fixed to the main body 21a. An oil seal (hereinafter referred to as a "first oil seal") 23 is provided on the outer periphery of the main shaft 22.

[0035] The upper opening of the main body 21a is closed by the lid 21b. The lid 21b in this embodiment is a disk having a size (diameter) similar to that of the main body 21a, and is provided at its center with an induction hole (inlet) 21i large enough to accommodate the lower guide portion 52 of the guide 50 described later.

[0036] When the lid portion 21b is attached to the main body portion 21a of the injection rotor 21, the guide holes 21i of the lid portion 21b, the flow paths 21d forming the storage space 21c of the main body portion 21a, and the injection ports 21e provided at the tip side of each flow path 21d are connected to each other, and function as flow paths for the object to be crushed X and the crushing media Y.

[0037] As shown in FIG. 2, an injector drive pulley 24 is provided on the output shaft of the injector drive motor M1, and an injector driven pulley 25 is provided on the lower end of the main shaft 22. An injector transmission belt 26 is wound around the outer periphery of the injector drive pulley 24 and the injector driven pulley 25.

[0038] The power of the injector drive motor M1 is transmitted through the injector driving pulley 24, the injector transmission belt 26, the injector driven pulley 25, and the main shaft 22 in that order, and the injector 20 is rotated by the transmitted power.

[0039] When the injection rotor 21 is rotated by the injection motor M1, the object to be ground X and the grinding media Y in the accommodation space 21c are moved outward by the centrifugal force caused by the rotation of the injection rotor 21, and are injected from the injection port 21e at the end of each flow path 21d through one of the flow paths 21d.

[0040] The rotation speed of the injection rotor 21 is preferably high, and as an example, the peripheral speed is preferably 10 to 50 m / sec. By adjusting the rotation speed, it is possible to adjust the collision force (impact force) when the pulverized media Y injected from the injection port 21e collides with the collision body 30. Specifically, the collision force can be increased by increasing the rotation speed, and the collision force can be decreased by decreasing the rotation speed.

[0041] Metal or ceramic beads or the like can be used as the grinding media Y. The size of the grinding media Y is preferably about 1 to 5 mm in diameter, and more preferably about 3 mm in diameter in consideration of the collision probability and kinetic energy. However, the grinding media Y may be larger or smaller than this.

[0042] <Collision object> The collision body 30 is a member against which the object to be pulverized X and the pulverization media Y injected from the injection port 21e of the injector 20 collide. The collision body 30 in this embodiment is a strip-shaped member rolled into a ring shape (annular shape), and is disposed outside the injection rotor 21 with a gap therebetween.

[0043] The collision body 30 is provided at the same or approximately the same height as the injection rotor 21. The inner surface of the collision body 30 faces the injection port 21e of the injection rotor 21 and functions as a collision surface against which the object to be pulverized X and the grinding media Y injected from the injection port 21e collide.

[0044] As shown in FIG. 1, on the inner surface of the lower member 13 of the grinding container 10, at a position inside the lower member upper flange 13c, multiple rod-shaped connecting members 31 (in this embodiment, four at 90° intervals) are provided at intervals.

[0045] Supports 32 for fixing the impact body 30 are provided at the tips of the multiple connecting members 31, and the ring-shaped impact body 30 is attached to the supports 32. In this manner, a gap is provided between the impact body 30 and the inner wall of the grinding container 10, and this gap functions as a passage through which the object to be ground X and the grinding media Y move.

[0046] The impact body 30 can be made of various materials, but similar to the grinding vessel 10, it is preferable to use a material other than metal, such as ceramics, from the viewpoint of preventing metal contamination.

[0047] <Mixer> The agitator 40 is a member that agitates and mixes the object to be ground X and the grinding media Y in the grinding chamber 11. The agitator 40 also serves to bounce the object to be ground X and the grinding media Y in the grinding chamber 11 upward in the grinding container 10. The agitator 40 is provided below the injector 20.

[0048] As shown in Figures 1 and 2, the agitator 40 of this embodiment includes an agitator rotor (hereinafter referred to as the "agitator rotor") 41, an outer shaft 42 fixed to the agitator rotor 41, and an agitator drive motor M2 (agitator drive source) that rotates the outer shaft 42 and the agitator rotor 41.

[0049] 1 and 4, the stirring rotor 41 of this embodiment is a dish-shaped member having a bottom surface portion 41a and a peripheral wall 41b that rises upward and spreads from the periphery of the bottom surface portion 41a. The bottom surface portion 41a of the stirring rotor 41 is provided with an opening (hereinafter referred to as a "flow hole") 41c that penetrates in the thickness direction. The flow hole 41c is an opening through which the object to be ground X and the grinding media Y pass (flow).

[0050] In this embodiment, the through holes 41c are circular, and eight of them are provided at equal intervals from the center of the bottom surface 41a. The configuration shown here is an example, and the shape, position, number, etc. of the through holes 41c can be determined appropriately.

[0051] An outer shaft insertion hole 41d is provided at the center position of the agitator rotor 41. An outer shaft 42 rotated by the agitator drive motor M2 is inserted from below into the outer shaft insertion hole 41d. The outer shaft 42 is provided outside the main shaft 22 so that its rotation axis is coaxial with the rotation axis of the main shaft 22.

[0052] The outer shaft 42 arranged in the outer shaft insertion hole 41d is fixed with a fastener (e.g., a screw or the like) to the stirring rotor 41. An oil seal (hereinafter referred to as a "second oil seal") 43 is provided on the outer periphery of the outer shaft 42.

[0053] A downwardly recessed portion 41e is provided at the center of the upper surface of the stirring rotor 41. A spacer 47 that forms a gap between the injection rotor 21 and the stirring rotor 41 is provided in the recessed portion 41e.

[0054] The spacer 47 provided in the recessed portion 41e of the stirring rotor 41 is configured so that its upper surface protrudes upward from the bottom surface portion 41a of the stirring rotor 41. The upper surface of the spacer 47 comes into contact with the bottom surface of the injection rotor 21, thereby ensuring a gap S between the injection rotor 21 and the stirring rotor 41.

[0055] When the injection rotor 21 and the stirring rotor 41 rotate, the object to be ground X and the grinding media Y may become trapped between them. If the two rotate in this state, the bottom surface of the injection rotor 21 and the surface of the stirring rotor 41 may be worn away by friction.

[0056] In this regard, by providing a spacer 47 between the injection rotor 21 and the agitator rotor 41 as in this embodiment, the object to be ground X and the grinding media Y are less likely to remain between the injection rotor 21 and the agitator rotor 41, thereby reducing the risk of wear on the bottom surface of the injection rotor 21 and the surface of the agitator rotor 41.

[0057] The width of the gap S is not limited, and can be determined according to the particle size of the object to be crushed X and the grinding media Y. For example, the risk of wear can be reduced by making the width of the gap S wider than the particle size of the object to be crushed X and the grinding media Y. A number of types of spacers 47 with different heights may be prepared so that an arbitrary one can be selected according to the particle size of the object to be crushed X and the grinding media Y.

[0058] 1 shows an example in which the spacer 47 is provided on the stirring rotor 41 side, but the spacer 47 can also be provided on the injection rotor 21 side. In this case, for example, a recess corresponding to the recessed portion 41e can be formed on the bottom surface side of the injection rotor 21, and the spacer 47 having a height greater than the depth of the recess can be inserted into the recess.

[0059] As shown in FIG. 2, an agitator drive pulley 44 is provided on the output shaft of the agitator drive motor M2, and an agitator driven pulley 45 is provided in the middle of the outer shaft 42. An agitator transmission belt 46 is wound around the outer periphery of the agitator drive pulley 44 and the agitator driven pulley 45.

[0060] The power of the agitator drive motor M2 is transmitted in the order of the agitator driving pulley 44, the agitator transmission belt 46, the agitator driven pulley 45, and the outer shaft 42, so that the agitator 40 is rotated by the transmitted power.

[0061] The rotation speed of the stirring rotor 41 can be, for example, a peripheral speed of about 10 to 30 m / sec. By adjusting the rotation speed, the magnitude of the shear force as well as the blowing up force of the object to be pulverized X and the pulverization media Y can be adjusted.

[0062] A bearing 48 and the like are provided between the main shaft 22 and the outer shaft 42. As described above, in this embodiment, the drive sources of the injection rotor 21 and the agitator rotor 41 are separate, so that even if the main shaft 22 is rotated by the injector drive motor M1, the outer shaft 42 does not rotate, and even if the outer shaft 42 is rotated by the agitator drive motor M2, the main shaft 22 does not rotate.

[0063] In this embodiment, the injection rotor 21 and the agitator rotor 41 can be rotated in the same direction or in opposite directions. The injection rotor 21 and the agitator rotor 41 can be rotated at a uniform speed or at non-uniform speed. In other words, the injection rotor 21 and the agitator rotor 41 can be operated in either the same direction simultaneous movement, the same direction differential movement, the opposite direction simultaneous movement, or the opposite direction differential movement. In the present invention, it is preferable that the drive unit is a two-shaft one, and the injection rotor 21 and the agitator rotor 41 rotate independently at any rotation speed, but it is also possible to use a single shaft structure in which they rotate at the same rotation speed.

[0064] <Derivative> The induction device 50 is a member that induces the object to be ground X and the grinding media Y that float in the grinding chamber 11 to the injector 20. The induction device 50 in this embodiment has an induction device upper part 51 formed in a funnel shape that widens upward, and a cylindrical induction device lower part 52. The lower end side of the induction device upper part 51 and the upper end side of the induction device lower part 52 are continuous, and the insides thereof are also connected.

[0065] An opening 51a is provided on the peripheral surface of the upper portion 51 of the induction body 50 for taking in the object to be ground X and the grinding media Y into the induction body 50. The object to be ground X and the grinding media Y floated in the grinding chamber 11 are taken into the induction body 50 through the opening 51a.

[0066] In this embodiment, the lower end of the lower portion 52 of the inductor is introduced into the storage space 21c of the injector 20, and the object to be ground X and the grinding media Y taken into the inductor 50 from the opening 51a of the upper portion 51 of the inductor are guided through the lower portion 52 of the inductor into the storage space 21c of the injector 20.

[0067] (operation) Next, the operation of the crushing device of this embodiment will be described. Note that the arrows shown in Fig. 1 indicate the movement (flow) of the object to be crushed X and the crushing media Y.

[0068] When the injection rotor 21, which has the object to be crushed X and the crushing media Y contained in the accommodation space 21c, rotates, the object to be crushed X and the crushing media Y move outward due to centrifugal force and are injected out of the accommodation space 21c from the injection port 21e at the end of each flow path 21d through one of the flow paths 21d of the injection rotor 21.

[0069] The object to be pulverized X and the crushing media Y ejected from the ejection port 21e collide with the collision body 30. The object to be pulverized X is crushed by the impact force at the time of the collision, and the surface energy of the particles is increased.

[0070] After the collision, the objects to be ground X that have fallen onto the agitator rotor 41 of the agitator 40 or onto the lower base 15 are ground by a shearing force generated by the rotation of the agitator 40. In addition, the objects to be ground X and the grinding media Y on the agitator rotor 41 and the lower base 15 rise along the inner wall of the grinding vessel 10 as the agitator 40 rotates.

[0071] The raised objects to be ground X and grinding media Y are taken into the inductor 50 through the opening 51a of the upper inductor 51, and are guided into the accommodation space 21c of the injection rotor 21 through the lower inductor 52 communicating with the upper inductor 51. During this operation, some of the objects to be ground X fall below the stirring rotor 41, while others adhere to the surfaces of the grinding media Y and circulate together with the grinding media Y.

[0072] Thereafter, this cycle is repeated for a set period of time, so that the crushing of the object X by the collision force (impact force) and shear force continues, and the object X can be finely divided. At this time, as the object X is finely divided, a change is brought about in the crystal structure, and mechanochemical processing (mechanochemical reaction) such as amorphization and compounding can be expected.

[0073] The configuration of the embodiment is merely an example, and the configuration of the crushing device of the present invention is not limited to the configuration of the embodiment. The crushing device of the present invention can be appropriately modified, such as by adding, replacing, or omitting components, within the scope of achieving the intended purpose. [Industrial Applicability]

[0074] The pulverizing device of the present invention can be used to pulverize alumina, silicon nitride, silicon carbide, dielectric materials, iron oxide, silica, battery materials, carbon, carbon nanotubes (CNT), magnesium oxide, ceramics, inorganic substances, and the like. [Explanation of symbols]

[0075] 10 Grinding container 11 Crushing chamber 12 Upper member 12a Upper opening 12b Lower opening 12c Upper part lower flange 12d Upper flange of upper part 13 Lower member 13a Upper end opening 13b Lower end opening 13c Lower part upper flange 14 Top lid 14a Disc Section 14b Lower protrusion 15 Lower Base 16 Discharge pipe 20 Injector 21 Injection rotor 21a Main body 21b Lid 21c Containment Space 21d Flow path 21e injection port 21f Spindle insertion hole 21g washer 21h Nut 21i Induction hole (intake port) 22 Main axis 23 Oil seal (first oil seal) 24 Injector drive pulley 25 Injector driven pulley 26 Injector transmission belt 30 Collider 31 Connecting material 32 Support 40 Mixer 41 Agitation rotor (agitation rotor) 41a Bottom part 41b Surrounding wall 41c opening (flow hole) 41d Outer shaft insertion hole 41e Recessed part 42 Outer shaft 43 Oil seal (second oil seal) 44 Agitator drive pulley 45 Agitator driven pulley 46 Agitator transmission belt 47 Spacer 48 Bearings 50 derivatives 51 Inductor upper part 51a aperture 52 Lower part of the derivative 60 frames M1 Injector drive motor (injector drive source) M2 Agitator drive motor (agitator drive source) S Gap X Crushing object Y Grinding Media

Claims

1. In a grinding device using grinding media, A grinding vessel having a grinding chamber therein; an injector for injecting the object to be crushed and the crushing media in the crushing chamber; A collision body is arranged ahead of the injection direction of the object to be pulverized and the pulverization media by the injector; An agitator that agitates the object to be ground and the grinding media in the grinding chamber; A guide is provided for guiding the object to be ground and the grinding media raised in the grinding container to the injector. A crushing device characterized by:

2. The grinding device according to claim 1, The injector includes an injection rotor and an injector drive source that rotates the injection rotor; The injection rotor is provided with an injection port for injecting the object to be crushed and the crushing media, A crushing device characterized by:

3. The crushing device according to claim 2, The injection rotor has an intake port for taking in the object to be ground and the grinding media guided by the induction device into the injection rotor. A crushing device characterized by:

4. The crushing device according to claim 2, Two or more injection ports are provided at intervals in the rotation direction of the injection rotor. A crushing device characterized by:

5. The crushing device according to claim 1 or 2, Between the inner wall of the grinding container and the impact body, a passage through which the grinding object and the grinding media can move is provided. A crushing device characterized by:

6. The crushing device according to claim 1 or 2, The collision body is annular, and has an inner surface provided with a collision surface against which the object to be crushed and the crushing media collide. A crushing device characterized by:

7. The crushing device according to claim 1 or 2, The agitator includes an agitator rotor and an agitator drive source for rotating the agitator rotor. A crushing device characterized by:

8. The crushing device according to claim 7, The bottom surface of the agitator is provided with a through hole penetrating in the thickness direction of the bottom surface. A crushing device characterized by:

9. The grinding device according to claim 1, A spacer is provided, The injector includes an injection rotor and an injector drive source that rotates the injection rotor; The agitator includes an agitator rotor and an agitator drive source that rotates the agitator rotor; The stirring rotor is disposed below the injection rotor, The spacer ensures a gap between the injection rotor and the stirring rotor. A crushing device characterized by:

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