JP2005199125A - Medium agitation mill - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a medium agitation mill stably performing crushing and separating without causing biting of medium nor clogging. <P>SOLUTION: This medium agitation mill is provided with a crushing tank 2 having a crushing chamber 3 for containing crushing medium 50, a main spindle 35 provided in the crushing tank 2, and an agitating separation member 25 provided at a position in the crushing chamber 3 of the main spindle 35. The agitating separation member 25 and the main spindle 35 are provided with a separating discharge passage 34 penetrating from an outer periphery of the agitating separation member 25 to a central part of the main spindle 35 to communicates with the outside of the crushing chamber 3. Rotation of the agitating separation member 25 provides the crushing medium 50 and the treatment object with a centrifugal force to agitate and crush the treatment object, and at the same time, the crushing medium 50 is efficiently separated from the crushed treatment object by the balance of the centrifugal force and a resistant force by fluid transporting the treatment object in the direction reverse to the acting direction of the centrifugal force, thereby discharging the treatment object to the outside of the crushing chamber 3 via the separating discharge passage 34. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a pulverizer, and more particularly to a media agitation mill effective for dispersion of inks and paints, pulverization and dispersion of ceramics, pulverization and dispersion of metals and inorganic substances, and pulverization and dispersion of pharmaceuticals.

  Media agitation mills are often used in the fields of dispersion of inks and paints, pulverization and dispersion of ceramics, pulverization and dispersion of metals and inorganic substances, and pulverization and dispersion of pharmaceuticals. Various types are already known. ing.

  Conventionally, a media agitating mill pulverizes a processed product by stirring the processed product and the pulverized media together by a stirring member provided in a pulverizing container, and a processed product by a separator provided at the end of the flow of the processed product after pulverization. And the pulverization media were separated, and only the treated product was discharged from the pulverization tank.

  In such a media agitation mill, a separator for separating the pulverized media and the processed product is indispensable, and a separator having a mechanical separation mechanism such as a gap type or a screen type has been used.

  However, in a separator having a mechanical separation mechanism, troubles such as biting and clogging always occur, and the stable continuous operation is threatened.

In order to solve such a problem of the separator, a centrifugal force is applied to the pulverization media and the processed material to stir and pulverize, and at the same time, the centrifugal force and the fluid transporting the processed material in the direction opposite to the centrifugal force are used. There has been proposed a media agitation mill (a pulverizer) including an agitation / separation member that separates a pulverized medium and a pulverized processed material in balance with the drag (see, for example, Patent Document 1).
JP 2003-144950 A

  However, in the media stirring mill (pulverizer) configured as described above, the stirring and separating member includes a front disk and a rear disk that face each other at a predetermined interval in the axial direction of the rotation shaft, and a circumferential direction. Since it has a complicated structure composed of a plurality of blades that intersect with both circular plates that are integrally provided at regular intervals toward the surface, it is expensive. For this reason, since the stirring / separating member is significantly worn depending on the type of the processed material, the replacement cost of the stirring / separating member is increased. Furthermore, in order to cope with the diversification of the processed products, the inner surface shape of the grinding tank can be changed and adjusted, but a large number of expensive stirring and separating members corresponding to the shape of the inner surface of the grinding tank must be held. Therefore, the cost was high.

  The present invention solves the conventional problems as described above, does not cause troubles such as biting and clogging, can be stably pulverized and separated, and has a simple and inexpensive structure. It is an object of the present invention to provide a media stirring mill provided with a proper stirring / separating member.

  In order to solve the above-described problems, a media agitating mill according to claim 1 of the present invention includes a grinding tank provided with a grinding chamber for containing grinding media therein, and a rotation provided rotatably in the grinding tank. A media stirring mill provided with a shaft and a stirring / separating member provided at a portion of the rotating shaft located in the grinding chamber and rotatable integrally with the rotating shaft, the inner wall surface of the grinding chamber and the stirring The outer peripheral surface of the member is formed in a shape that matches each other, penetrates from the outer peripheral surface of the stirring separation member to the central portion of the stirring member, and passes through the central portion of the rotating shaft from that portion to the outside of the grinding chamber. Means for providing a separation and discharge passage communicating with each other and a pressure relaxation hole penetrating between the upper and lower surfaces of the stirring member in the axial direction of the rotary shaft and communicating between the upper portion and the lower portion in the grinding chamber. Adopted.

  A media agitation mill according to claim 2 of the present invention is the media agitation mill according to claim 1, wherein the pulverization tank has a casing, an inner wall detachably attached to the casing, and a bottom lid. A means in which the crushing chamber is formed in a portion surrounded by the inner wall and the bottom lid is employed.

  Furthermore, the media agitation mill according to claim 3 of the present invention is the media agitation mill according to claim 2, wherein the crushing chamber formed by a portion surrounded by the inner wall and the bottom lid is rotated in the rotation direction. A means that uses a spherical, polygonal, or concavo-convex space as a center of the axis is adopted.

  Furthermore, the media stirring mill which concerns on Claim 4 of this invention is a media stirring mill in any one of Claim 1 to 3, Comprising: On the outer peripheral surface of the said stirring member, it is every predetermined space | interval in the circumferential direction. A means provided with a plurality of stirring protrusions is employed.

  Furthermore, the media agitation mill according to claim 5 of the present invention is the media agitation mill according to any one of claims 1 to 4, wherein a treatment product supply port is provided at an upper portion of the crushing chamber, and the treatment A means in which the stirring / separating member is provided below the supply port of the object is employed.

Since the present invention is configured as described above, a centrifugal force is applied to the pulverization media and the processed material by the rotation of the stirring separation member to stir and pulverize the processed material, and at the same time, the direction of action of the centrifugal force and the centrifugal force. The pulverization media and the pulverized processed material can be efficiently separated and discharged out of the pulverization chamber via the separation discharge path by the balance with the drag force by the fluid transporting the processed product in the opposite direction.
Therefore, a separator that mechanically separates the pulverized media and the processed material is not required, and troubles such as biting into the separator and clogging do not occur, and the processed product is stably pulverized and separated. In particular, it is effective for the pulverization process using a pulverization medium of 100 μm or less.
Further, since the inner wall and the bottom lid constituting the grinding chamber are configured to be detachable from the casing, the grinding chamber can be formed into a predetermined shape by replacing the inner wall and the bottom lid with a desired shape and size. , Can be changed and adjusted to dimensions. Therefore, since the shape and dimensions of the grinding chamber can be changed and adjusted according to the type of processed material and the degree of grinding, versatility can be improved. Moreover, since the material of the inner wall and the bottom lid can be changed according to the type of the processed material, it is possible to prevent the inner surface of the grinding chamber from being worn depending on the type of the processed material, and to stably pulverize and separate the processed material. be able to.
Furthermore, since the supply port for the processed material is provided in the upper part of the pulverization chamber, and a stirring separation member is provided below the supply port, the processed material supplied from the supply port into the pulverization chamber is efficiently pulverized and separated. Thus, it can be discharged from the separation outlet into the grinding chamber.

  In the media agitating mill of the present invention, when the agitating / separating member rotates, the pulverized media and the processed material to be pulverized are given centrifugal force by the agitating protrusion, and the rotation of the pulverizing media dragged by the rotating force of the agitating protrusion In addition to the movement and the swiveling motion of the transport fluid of the processed material, the grinding media and the processed material to be pulverized are agitated, and the processed material to be pulverized is pulverized.

  Simultaneously with this pulverization, there is also a separation function that mechanically separates the pulverized media and the pulverized processed material from the balance between the centrifugal force and the drag force caused by the transport fluid of the processed material flowing in the opposite direction of the centrifugal force. It has the feature that it is held together, crushed and separated by one mechanism. Further, in order to enable the pulverization / separation to be processed by one mechanism, the flow of the fluid transporting the processed material is made to be opposite to the direction of the centrifugal force generated by the stirring / separating member, and from the outer peripheral side of the stirring / separating member. The hollow portion in the rotating shaft passes through the central portion and reaches the discharge port connected to the hollow portion.

  The slurry-like processing fluid is sent from the supply port into the pulverization tank by pressure feeding, and is mixed with the pulverization medium in the pulverization tank. By rotating the rotating shaft connected to the drive source, the agitation / separation member is integrally rotated, and the pulverization media that have entered the communication hole of the agitation / separation member and the material to be pulverized are subjected to centrifugal force. Further, the pulverizing media has a rotational movement following the stirring protrusion, and the transport fluid has a swirling flow. Therefore, the pulverization media or the coarse particles to be pulverized are stirred together in the pulverization tank or through the communicating hole of the stirring / separating member, and the coarse particles are pulverized.

  The pulverized fine particles are separated in the agitation / separation member by being superior in resistance to the centrifugal force obtained by the communication hole of the agitation / separation member and received from the transport fluid that flows while swirling from the pulverization tank into the agitation / separation member. It is transported with the fluid to the chamber. The slurry fluid that has flowed into the separation chamber is sent to the hollow portion of the rotating shaft that communicates with the separation chamber, and is further guided to the discharge port. On the other hand, the grinding media is orders of magnitude (more than 30 times) the size of the pulverized product, and naturally the centrifugal force received from the communicating hole of the stirring / separating member is superior in drag and enters the separation chamber inside the stirring / separating member. It cannot be carried out and stays in the part of the communicating hole in the stirring / separating member or in the grinding tank. Further, a part of the coarse particles that have not been pulverized, like the pulverization media, cannot enter the separation chamber in the stirring / separation member due to the acting force relationship, and are pulverized again. As described above, in the pulverizer according to the present invention, since the force relationship acting between the pulverized fine particles and the pulverization media is different, the pulverizer is naturally mechanically separated, and the need for mechanical separation does not occur. .

  The balance between the centrifugal force and the drag force affecting the separation action is controlled by the rotational speed of the stirring / separating member. By increasing the rotation speed of the stirring and separating member, the centrifugal force can be increased, the drag can be suppressed, and the separated particle size can be reduced. Furthermore, the grinding effect is also improved.

The magnitude of the centrifugal force acting on the grinding media or the grinding particles is proportional to the volume of the media and particles, and the magnitude of the drag acting on the media and particles is perpendicular to the force of the fluid acting on the media and particles. It is proportional to the projected area. That is, the larger the particle size, the greater the increase in centrifugal force than the increase in drag.
(Example)
Spherical particle centrifugal force of diameter d
Fc∝d3
Drag
Fd∝d2
With diameter d1
Fc = Fd
And assuming the balance, the diameter is 2d1
Fc / Fd = 2
With a diameter of 0.5d1
Fc / Fd = 0.5
When the particle size is larger than d1, centrifugal force is excellent, and when the particle size is small, drag is excellent. Therefore, when the centrifugal force and the drag force are set so as to balance at a predetermined particle diameter, the centrifugal force is superior at a predetermined diameter or more, and the drag is excellent at a predetermined diameter or less. Naturally, the grinding media is an order of magnitude larger than the predetermined particle size, so that a large centrifugal force acts due to the rotation of the stirring / separating member, and this centrifugal force sufficiently opposes the drag and enters the stirring / separating member. Can be prevented.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 show an embodiment of a media stirring mill according to the present invention. FIG. 1 is an enlarged sectional view of the media stirring mill, and FIG. 2 is a partially enlarged plan view of FIG. 3 is a flow diagram showing an example of a media agitation system configured using the media agitation mill shown in FIG.

  That is, the media agitating mill 1 includes a pulverization tank 2 in which a pulverization chamber 3 is provided, a hollow main shaft 35 that is a rotation shaft provided rotatably at the center of the pulverization tank 2, and a pulverization chamber 3 of the main shaft 35. A stirring / separating member 25 that is attached to a portion located inside and is rotatable integrally with the main shaft 35 is provided.

  The crushing tank 2 includes a substantially cylindrical casing 5 whose upper end is closed, a bottom lid 14 that closes a lower end opening of the casing 5, and an inner wall 9 provided on the inner surface side of the casing 5, A grinding chamber 3 that is a substantially spherical space is formed in a portion surrounded by the inner surface of the inner wall 9 and the upper surface of the bottom lid 14.

  The inner surface side of the lower end portion of the casing 5 is formed in two stages of a small diameter portion 6 and a large diameter portion 7, and an inner wall 9 is detachably attached from the small diameter portion 6 to the large diameter portion 7, and the outer side (lower side) of the inner wall 9. A bottom cover 14 is detachably attached to the large diameter portion 7.

  The inner wall 9 includes a cylindrical main body portion 10 and a flange portion 12 that is integrally provided on the outer peripheral side of the lower end portion of the main body portion 10 and that projects in an annular shape outwardly in the radial direction. The side (excluding the upper end) is formed in a curved surface 11 having a predetermined curvature that is recessed outward in the radial direction. The inner wall 9 has the main body portion 10 fitted in the small diameter portion 6 of the casing 5, the flange portion 12 is brought into contact with the boundary portion between the small diameter portion 6 and the large diameter portion 7, and the flange portion 12 is bounded by the bolt 13. Is fixed to the casing 5.

  The bottom cover 14 includes a disk-shaped main body 15 and a flange portion 16 that is integrally provided on the outer peripheral side of the lower end of the main body 15 and projects in a radially outward manner. The upper surface side of the taper surface 17 is formed in a tapered surface 17 having a predetermined angle recessed downward, and the upper end portion of the tapered surface 17 is formed in a curved surface 18 continuous with the curved surface 11 of the inner wall 9. The bottom cover 14 is formed by fitting the main body portion 15 into the large-diameter portion 7 of the casing 5, bringing the flange portion 16 into contact with the opening end surface of the casing 5, and connecting the flange portion 16 to the opening end surface with a bolt 19. , Fixed to the casing 5. A through hole 20 penetrating between the upper and lower surfaces is provided at the center of the bottom lid 14, and the through hole 20 is configured to be opened and closed by an on-off valve 21.

  An O-ring 22 is interposed between the outer peripheral surface of the main body 15 of the bottom lid 14 and the inner peripheral surface of the large-diameter portion 7 of the casing 5, and the O-ring 22 seals between them.

  The inner wall surface 4 of the crushing chamber 3 is constituted by the inner surface of the inner wall 9 and the upper surface of the bottom lid 14 configured as described above, and the inner wall surface 4 of the crushing chamber 3 is protected by the cooperation of the inner wall 9 and the bottom lid 14. Is done. The shape of the inner wall surface 4 of the crushing chamber 3 and the size of the crushing chamber 3 can be adjusted to the desired shape and size by changing the inner wall 9 and the bottom lid 14 to those of the desired shape and size. The shape of the inner wall 9 (the shape of the inner surface) and the shape of the bottom lid 14 (the shape of the upper surface) are not particularly limited, and can be set to an appropriate shape according to the type of pulverized product, the degree of pulverization, and the like. . For example, the cross-sectional shape of the inner surface of the inner wall 9 can be a circle, a polygon, an uneven shape, or the like.

  The outer wall corresponding to the crushing chamber 3 of the casing 5 has a jacket structure (not shown), and a cooling medium is circulated inside the jacket structure, and the temperature in the crushing chamber 3 rises due to the heat generated when the processed material is pulverized. You may comprise so that this may be suppressed.

  The agitating / separating member 25 is provided on the lower surface side of the rotor body 27 and is fixed to the lower surface of the main shaft 35 by a bolt 29. A rotor 26 is provided that includes a rotor body presser 28 that presses the rotor body 27 into a state of being fitted to the main shaft 35.

  The rotor 26 is formed in a shape corresponding to the shape of the inner wall surface 4 (inner surface) of the crushing chamber 3, and in this embodiment, the crushing chamber 3 is formed in a substantially spherical space. Therefore, the outer surface shape of the rotor 26 is formed in a substantially spherical shape correspondingly.

  As shown in FIG. 2, the outer peripheral surfaces of the rotor main body 27 and the rotor main body presser 28 are externally provided at a plurality of positions (eight positions in this embodiment) at equal intervals in the circumferential direction. A stirring protrusion 30 protruding in the direction is integrally provided. The shape of the stirring protrusion 30 is not particularly limited, and is formed in a rectangular cross section in this embodiment.

  A portion that faces the outer peripheral surface of the lower end portion of the main shaft 35 at the center of the rotor body 27 is provided with a substantially cylindrical separation chamber 31 that is a sealed space in which the lower end opening is closed by the rotor body retainer 28. ing.

  In the outer part of the separation chamber 31 of the rotor body 27, a plurality of locations are provided such that the communication groove 32 having a rectangular cross section whose lower end opening is closed by the rotor body retainer 28 is formed radially around the center of the rotor body 27. (In this embodiment, four locations), and the inside of the separation chamber 31 is opened to the outer peripheral surface side of the rotor body 27 by the communication groove 32.

  In the outer portion of the separation chamber 31 of the rotor body 27, a ball circulation hole 33 having a circular cross section that penetrates the rotor body 27 and the rotor body retainer 28 in the axial direction is provided at a plurality of positions at equal intervals in the circumferential direction ( In this embodiment, it is provided at four locations).

  The main shaft 35 has a hollow shape provided in a state where the communication passage 36 penetrates through the central portion, and a portion corresponding to the separation chamber 31 penetrates the main shaft 35 in the radial direction and has one end separated in the separation chamber 31. A plurality of communication holes 37 are provided, the other end of which communicates with the communication path 36. A series of separation discharge passages 34 communicating with the inside and outside of the grinding chamber 3 are formed by the communication passage 36 and the communication hole 37 of the main shaft 35 and the separation chamber 31 and the communication groove 32 of the rotor 26 described above. Thus, the processed product in the crushing chamber 3 is discharged out of the crushing chamber 3.

  As shown in FIG. 3, a rotary joint 38 having a discharge port is attached to the upper end portion of the main shaft 35. A holding tank 46 is connected to the discharge port of this through a pipe 43 described later.

  A portion of the casing 5 corresponding to the upper part of the crushing chamber 3 is provided with a slurry supply pipe 8 that communicates the inside and outside of the casing 5, and the processed material is supplied into the crushing chamber 3 through the slurry supply pipe 8.

  A shaft seal 39 is provided between the outer peripheral surface of the main shaft 35 and the inner peripheral surface of the casing 5. The shaft seal 39 seals between the two to prevent fluid from leaking out of the grinding chamber 3. ing.

  A V pulley (not shown) is attached to the upper end of the main shaft 35, and this V pulley is connected to a drive source (not shown) via a V belt (not shown). The main shaft 35 is configured to be rotationally driven via a V belt and a V pulley.

  Then, the media agitation mill 1 according to this embodiment configured as described above is fixed to the side surface of the frame 42 erected perpendicularly to the upper portion of the gantry 41 so that the axis of the main shaft 35 faces the vertical direction. A circulation pump 44 is connected to the supply pipe 8 via a pipe 43, a holding tank 46 is connected to the circulation pump 44 via a pipe 43 and a main valve 45, and the holding tank 46 and the rotary joint 38 of the media agitating mill 1 are connected. The media agitation system 40 is configured by connecting the two through a pipe 43.

  Then, the processed product is put into the holding tank 46 of the media stirring system 40 configured as described above, and stirred by the stirrer 48 to produce a slurry-like processed product. In this case, the outer wall of the holding tank 46 is constituted by a jacket structure 47, and the inside of the jacket structure 47 is made to circulate a cooling medium so as to cool the inside of the holding tank 46 and to stir the processed material in the holding tank 46. The generated heat is cooled, and the processed product discharged from the media stirring mill 1 (heated by collision, friction, etc. in the grinding chamber) is cooled.

  Then, by opening the main valve 45 and operating the circulation pump 44, the grinding tank of the media agitating mill 1 is passed from the holding tank 46 through the main valve 45, the pipe 43, the circulation pump 44, the pipe 43, and the slurry supply pipe 8. The processed material is pumped into the pulverizing chamber 3 of 2. When the drive source is activated to rotate the rotor 26 of the stirring / separating member 25 integrally with the main shaft 35, the rotation of the rotor 26 causes the grinding media 50 and the processed material to receive centrifugal force, and the rotational force of the rotor 26. Rotating motion is generated in the pulverizing medium 50 by the dragging, and a swirling flow is generated in the fluid that has transported the processed material. For this reason, the grinding media 50 or the processed material (coarse particles) are stirred together in the grinding chamber 3 or by the stirring protrusion 30 of the rotor 26, and the coarse particles are crushed. In this case, the rotational speed of the rotor 26 or the number of stirring protrusions 30 is determined in consideration of the size of the particles to be crushed. Accordingly, naturally, the grinding media 50 receives a centrifugal force superior to the pushing force by the fluid, and stays in the communication groove 32 of the rotor 26 or the grinding chamber 3.

  In accordance with the rotational force of the rotor 26, a rotational motion occurs in the grinding media 50, and in some cases, a pressure difference may be generated between the upper part and the lower part of the grinding chamber 3. This pressure difference causes a thrust force to be applied to the main shaft 35, which may cause vibration, but the rotor 26 is provided with a ball circulation hole 33, through which the grinding media 50 and the slurry-like processed material circulate. Therefore, the pressure difference generated between the upper part and the lower part of the crushing chamber 3 can be reduced, the thrust force acting on the main shaft 35 can be reduced, and the vibration of the main shaft 35 can be prevented.

  The finely pulverized particles are pushed into the separation chamber 31 from the communication groove 32 of the separation / discharge passage 34 as a slurry-like fluid because the pushing force is superior to the centrifugal force. The pushed slurry-like fluid reaches the communication path 36 via the communication hole 37, reaches the discharge port of the rotary joint 38 from the communication path 36, and reaches the holding tank 46 via the pipe 43.

  Since the present invention is configured as described above, the pulverization medium 50 and the processed material are stirred and pulverized by the centrifugal force applied by the rotation of the rotor 26 of the stirring / separating member 25. The pulverization media 50 and the pulverized processed material are separated from each other by the balance between the drag force caused by the fluid transporting the processed material in the direction opposite to the direction in which the force is applied. Therefore, unlike a separator having a mechanical separation mechanism, troubles such as biting and clogging do not occur, and stable continuous operation is possible. In particular, it is effective for processing using media of 100 μm or less.

  The inner shape of the grinding chamber 3 of the grinding tank 2 and the outer shape of the rotor 26 of the stirring / separating member 25 can be changed or adjusted each time depending on the degree of grinding, for example, the inner surface of the grinding chamber 3 of the grinding tank 2. The shape can be selected in consideration of the degree of pulverization or the processed material by making the cross-section spherical shape, polygonal shape, etc.

  By adopting a structure in which the inner surface shape of the grinding chamber 3 of the grinding tank 2 can be changed and adjusted, it becomes easy to cope with the wear of the inner wall surface 4 of the grinding chamber 3. For example, replacement by wear can be performed for each part. For this reason, the types of materials that can be selected increase, and it becomes easy to use a special material such as a wear-resistant material as the inner wall surface 4 of the crushing tank 2.

It is sectional drawing which showed one Embodiment of the media stirring mill by this invention. It is a cross-sectional view of the stirring separation member of FIG. It is the flowchart which showed an example of the media stirring system comprised using the media stirring mill shown in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Media stirring mill 2 Crushing tank 3 Crushing chamber 4 Inner wall surface 5 Casing 6 Small diameter part 7 Large diameter part 8 Slurry supply pipe 9 Inner wall 10 Main body part 11 Curved surface 12 Flange part 13 Bolt 14 Bottom cover 15 Main body part 16 Flange part 17 Tapered surface 18 Curved surface 19 Bolt 20 Through hole 21 On-off valve 22 O-ring 25 Stirring separation member 26 Rotor 27 Rotor main body 28 Rotor main body pressing 29 Bolt 30 Stirring projection 31 Separation chamber 32 Communication groove 33 Ball circulation hole 34 Separation discharge path 35 Main shaft 36 Communication path 37 communication hole 38 rotary joint 39 shaft seal 40 media agitation system 41 mount 42 frame 43 piping 44 circulation pump 45 main valve 46 holding tank 47 jacket structure 48 agitator 50 grinding media

Claims (5)

A crushing tank provided with a crushing chamber for containing crushing media therein, a rotating shaft rotatably provided in the crushing tank, and a portion of the rotating shaft located in the crushing chamber are integrated with the rotating shaft. A media stirring mill comprising a rotatable stirring separation member,
The inner wall surface of the crushing chamber and the outer peripheral surface of the stirring member are formed in a shape that matches each other, penetrates from the outer peripheral surface of the stirring separation member to the central portion of the stirring member, and from that portion the center of the rotating shaft A separation discharge path that passes through the section and communicates with the outside of the grinding chamber and an upper and lower surfaces of the stirring member penetrate in the axial direction of the rotation shaft, and communicate between the upper and lower portions in the grinding chamber. A media agitation mill provided with a pressure relaxation hole.   The pulverization tank has a casing, an inner wall detachably attached to the casing, and a bottom lid, and the pulverization chamber is formed in a portion surrounded by the inner wall and the bottom lid. The media agitation mill described in 1.   The pulverization chamber formed by a portion surrounded by the inner wall and the bottom lid is a spherical, polygonal, or concavo-convex space that is an axis object around the rotation axis. The media stirring mill described.   The media stirring mill according to any one of claims 1 to 3, wherein a plurality of stirring protrusions are provided at predetermined intervals in the circumferential direction on the outer peripheral surface of the stirring member.   The media stirring mill according to any one of claims 1 to 4, wherein a processing product supply port is provided at an upper portion of the crushing chamber, and the stirring separation member is provided below the processing product supply port.

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