Wet bead mill

Abstract

Provided is a wet bead mill capable of maintaining high dispersion efficiency by preventing a grinding medium from flowing out to the outside of a processing chamber during dispersion processing. A wet bead mill (1) according to the present invention is provided with: a processing chamber (2) for accommodating a mixture of a slurry containing crushed aggregates and a crushing medium; a stirring device (A) that performs dispersion treatment and / or decomposition crushing treatment and / or pulverization treatment of the crushed material by rotating in the treatment chamber (2); a slurry passage (12) that has an opening in the processing chamber (2) and that guides the slurry to the outside of the processing chamber; a baffle (5) is provided in the processing chamber (2) to generate a flow of a portion of the slurry stirred by the stirring device (A) toward the inside of the processing chamber, thereby mixing the flow of the slurry toward the inside of the processing chamber (A) with the flow of the slurry flowing out of the processing chamber (A) through the slurry passage (12). The pulverization medium is prevented from flowing out to the outside of the processing chamber (A) through the slurry passage (12).

Description

Technical Field

[0001] The present invention relates to a wet bead mill having excellent dispersing performance.

[0002] The invention also relates to a wet bead mill which can be used as a pulverizer or a disintegrator. Background Art

[0003] In a vertical wet bead mill, if the stirring device is rotated in a simple cylindrical dispersion chamber, the grinding beads as the grinding medium are easily blown up in the slurry due to the vortex caused by the stirring and reach the periphery of the centrifugal separation device arranged above the stirring device in the dispersion chamber. Depending on the conditions, a large number of these flying grinding beads are retained in the upper part of the dispersion chamber, causing the so-called grinding bead accumulation phenomenon, which ultimately hinders the normal rotation of the centrifugal separation device and may cause abnormal heat or abnormal load.

[0004] Japanese Patent Application Laid-Open No. 2013-39508 discloses a medium stirring type pulverizer that can obtain a slurry in which nano-sized particles are dispersed and can be pulverized stably without causing aggregation of solid particles.

[0005] Japanese Patent Publication No. 2007-125454 discloses a high-speed stirring device for mixing and stirring liquid and liquid or powder and liquid to micronize and emulsify and disperse the components. The high-speed stirring device comprises a cylindrical stirring tank with concave and convex inner circumference, a rotating blade which is concentric with the stirring tank and has an outer diameter slightly smaller than the inner diameter of the stirring tank, and a shaft which has the rotating blade at the end and can rotate forward and backward at high speed. By rotating the shaft at high speed, the rotating blade rotates at high speed, so that the treated liquid introduced into the stirring tank is stirred while being rotated at high speed in a thin film cylindrical shape along the inner circumference with concave and convex of the stirring tank.

[0006] Patent Document 1: (Japanese) Patent Publication No. 2013-39508

[0007] Patent Document 2: (Japanese) Patent Publication No. 2007-125454 Summary of the invention

[0008] Technical problem to be solved by the invention

[0009] An object of the present invention is to provide a wet bead mill having excellent dispersing performance by preventing a pulverizing medium from flowing out of a treatment chamber during a dispersing process to thereby maintain a high dispersing efficiency.

[0010] Another object of the present invention is to provide a wet bead mill that can be used as a pulverizer or a disintegrator.

[0011] Technical solutions for solving technical problems

[0012] The wet bead mill of the present invention comprises: a processing chamber that accommodates a mixture of a slurry containing crushed materials and a pulverizing medium; a stirring device that stirs the mixture by rotating in the processing chamber to perform a dispersion process and / or a decomposition and crushing process and / or a pulverizing process of the crushed materials; a slurry passage that has an opening in the processing chamber and guides the slurry to the outside of the processing chamber; it is characterized in that a rotating shaft is provided to rotate the stirring device, a hole is provided in the processing chamber for the rotating shaft to be inserted, the rotating shaft extending to the inside of the processing chamber through the hole is connected to the stirring device, the slurry passage is divided along the side of the rotating shaft, a baffle is provided in the processing chamber, so that a part of the slurry stirred by the stirring device flows toward the inside of the processing chamber, the baffle is used to mix the flow of the slurry toward the inside of the processing chamber with the flow of the slurry flowing out of the processing chamber through the slurry passage, and the pulverizing medium is prevented from flowing out of the processing chamber through the slurry passage.

[0013] The baffle plate of the wet bead mill of the present invention is characterized by having a slurry guide surface surrounding the opening of the slurry passage, the slurry guide surface being inclined in the direction opposite to the flow direction of the slurry flowing out of the processing chamber through the slurry passage near the opening.

[0014] The slurry guide surface of the wet bead mill of the present invention may be composed of a concave curved surface.

[0015] The slurry guide surface of the wet bead mill of the present invention may be composed of a conical surface that is inclined toward the opening toward the inside of the processing chamber.

[0016] The baffle of the wet bead mill of the present invention has a branch passage, which has an inlet opening for the slurry on the slurry guide surface and an outlet opening for the slurry in the middle of the slurry passage. A second slurry guide surface is formed in the branch passage, and the second slurry guide surface is inclined in the opposite direction relative to the flow direction of the slurry flowing out of the processing chamber through the slurry passage near the outlet opening.

[0017] The stirring device of the wet bead mill of the present invention has a vane plate opposite to the slurry guide surface and an end plate opposite to the bottom surface of the processing chamber, the vane plate has stirring blades extending in a radial direction and protruding toward the slurry guide surface, and the end plate has stirring blades extending in a radial direction and a plurality of through holes extending in an axial direction.

[0018] The end disc of the wet bead mill of the present invention may have a smaller diameter than the vane disc.

[0019] Furthermore, the agitating blades of the end plate of the wet bead mill of the present invention may be formed only on the blade plate side.

[0020] In the wet bead mill of the present invention, a second processing chamber can also be divided in the middle of the slurry passage of the baffle, a second crushing disk can be arranged in the second processing chamber, the second crushing disk can be connected to the rotating shaft, and a slurry guide surface extending toward the slurry passage can be formed in the second processing chamber.

[0021] In the wet bead mill of the present invention, a slurry inflow space may be defined above the slurry guide surface of the treatment chamber of the baffle plate, and a slurry guide surface extending toward the slurry passage may be formed in the slurry inflow space.

[0022] The wet bead mill of the present invention comprises: a processing chamber for accommodating a mixture of a slurry containing crushed materials and a pulverizing medium; a stirring device for stirring the mixture by rotating in the processing chamber to perform a dispersion process and / or a decomposition and crushing process and / or a pulverizing process on the crushed materials; a slurry passage having an opening in the processing chamber and leading the slurry to the outside of the processing chamber; and characterized in that:

[0023] A rotating shaft for rotating the stirring device is provided, a hole for inserting the rotating shaft is provided in the processing chamber, the rotating shaft extending through the hole to the interior of the processing chamber is connected to the stirring device, the slurry passage is divided along the side of the rotating shaft, a buffer chamber is provided in the processing chamber, the processing chamber and the buffer chamber are connected via the slurry passage, the slurry passage has a slurry inlet in the processing chamber, the slurry passage has a slurry outlet in the buffer chamber, and a pulverizing medium separation device for separating the pulverizing medium from the slurry is arranged in the buffer chamber.

[0024] In the wet bead mill of the present invention, the buffer chamber can be arranged above the treatment chamber, and a cylindrical surface and a truncated conical surface extending in a mortar shape from the lower end of the cylindrical surface toward the slurry outflow outlet of the slurry passage are formed on the inner surface of the buffer chamber. The pulverizing medium separation device is constituted by a centrifugal separation device, and the centrifugal separation device is arranged at a position surrounded by the cylindrical surface of the buffer chamber so that the upper outer diameter of the centrifugal separation device is larger than the lower outer diameter of the centrifugal separation device.

[0025] In the wet bead mill of the present invention, a swastika-shaped slurry passage may be provided in the centrifugal separation device.

[0026] In the wet bead mill of the present invention, the pulverizing medium separation device may be composed of a gap partition and / or a wire mesh that prevents the pulverizing medium from passing through.

[0027] In the wet bead mill of the present invention, the rotating shaft may extend into the processing chamber through the buffer chamber.

[0028] In the wet bead mill of the present invention, the rotating shaft may be extended into the processing chamber through the buffer chamber, and the rotating shaft may be connected to the centrifugal separator.

[0029] The wet bead mill of the present invention comprises: a processing chamber, which accommodates a mixture of a slurry containing crushed materials and a pulverizing medium; a stirring device, which stirs the mixture by rotating in the processing chamber to perform dispersion processing and / or decomposition and crushing processing and / or pulverizing processing of the crushed materials; a slurry passage, which has an opening in the processing chamber and guides the slurry to the outside of the processing chamber; it is characterized in that the inner surface of the processing chamber is composed of a cylindrical surface, and a plurality of grooves are formed on the cylindrical surface at prescribed intervals, and the plurality of grooves extend at prescribed angles relative to the axial direction of the rotating shaft of the stirring device.

[0030] The plurality of grooves on the inner surface of the processing chamber of the wet bead mill of the present invention may each have a cross-sectional shape that is smoothly curved in a concave shape.

[0031] The plurality of concave grooves on the inner surface of the processing chamber of the wet bead mill of the present invention may each be composed of parallel grooves extending parallel to the axis of the rotating shaft of the stirring device.

[0032] The parallel grooves on the inner surface of the processing chamber of the wet bead mill of the present invention may be divided into upper parallel grooves and lower parallel grooves, and the upper parallel grooves and the lower parallel grooves may be arranged with phases shifted.

[0033] The multiple grooves on the inner surface of the processing chamber of the wet bead mill of the present invention can be respectively composed of inclined grooves extending obliquely relative to the axial direction of the rotating axis of the stirring device, and the inclined grooves are located along the rotation direction of the stirring device and the phase of the lower part of the inclined groove is earlier than the phase of the upper part of the inclined groove.

[0034] The groove on the inner surface of the processing chamber of the wet bead mill of the present invention can be composed of a spiral groove wound around the rotating shaft of the stirring device, and the spiral groove extends from the upper part to the lower part on the inner surface of the processing chamber along the rotation direction of the stirring device.

[0035] Effects of the Invention

[0036] According to the wet bead mill of the present invention, the movement of the pulverizing media in the processing chamber can be controlled, and the amount of the pulverizing media flowing from the processing chamber into the buffer chamber can be reduced, so that an excellent dispersion result can be obtained.

[0037] Furthermore, according to the wet bead mill of the present invention, the possibility of the pulverizing media separated from the slurry in the buffer chamber flowing again into the pulverizing media separation device such as a centrifugal separator can be reduced, so the slurry processing capacity can be improved.

[0038] Furthermore, the wet bead mill of the present invention can also be used as a pulverizer or a disintegrator.

[0039] Other features and effects of the wet bead mill of the present invention will become apparent from the following description made with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is an overall structural diagram of an embodiment of the wet bead mill of the present invention (Example 1).

[0041] Figure 2 yes Figure 1 A longitudinal sectional view of the main parts of a wet bead mill.

[0042] Figure 3 yes Figure 2 Bottom view of a wet bead mill.

[0043] Figure 4 (A) is Figure 2 A top view of the bottom plate of a wet bead mill. Figure 4 (B) is a cross-sectional view of the base plate.

[0044] Figure 5 (A) is a cross-sectional view of the inner wall component of the processing chamber, Figure 5 (B) is a three-dimensional view of the cylindrical surface constituting the inner surface of the inner wall member, Figure 5 (C) is a bottom view of the inner wall component.

[0045] Figure 6 (A) is a top view of the blade plate of the stirring device, Figure 6 (B) is a side view of a section including a portion of the wing disc, Figure 6 (C) is a bottom view of the wing disc.

[0046] Figure 7 (A) is a top view of the end plate of the stirring device. Figure 7 (B) is a longitudinal sectional view of the end plate. Figure 7 (C) is a bottom view of the end plate.

[0047] Figure 8 (A) is a longitudinal section view of the ring (large), Figure 8 (B) is a bottom view of the ring (large).

[0048] Fig. 9 (A) is the top view of the baffle. Fig. 9 (B) is a longitudinal sectional view of the baffle. Fig. 9 (C) is a bottom view of the baffle.

[0049] Fig.10 It is a longitudinal sectional view of the deformed state of the baffle.

[0050] Fig.11 (A) is a longitudinal sectional view of the inner wall component of the buffer chamber, Fig.11 (B) is a bottom view of the inner wall component.

[0051] Fig.12 (A) is a top view of the top plate of the buffer chamber. Fig.12 (B) is a cross-sectional view of the top plate.

[0052] Fig.13 (A) is a top view of the upper part of the centrifugal separation device, Fig.13 (B) is a longitudinal sectional view of the upper part, Fig.13 (C) is a bottom view of the upper component.

[0053] Fig.14 (A) is a top view of the lower part of the centrifugal separation device, Fig.14 (B) is a longitudinal sectional view of the lower part, Fig.14 (C) is a bottom view of the lower component.

[0054] Fig.15 (A) is a top view of the ring (small), Fig.15 (B) is a longitudinal sectional view of the ring (small), Fig.15 (C) is a plan view showing a swastika-shaped groove formed on the upper surface of the collar (small), which shows the positional relationship with the lower part of the centrifugal separation device.

[0055] Fig.16 This is a schematic diagram of a centrifugal separation blade showing the form of a slurry flow path formed in a centrifugal separation device.

[0056] Fig.17 It was filmed from Figure 2 Photo of a wet bead mill with the top plate extending downward toward the rotating axis.

[0057] Fig.18 It was filmed in Fig.17 A photograph showing a stirring device, a collar (large), a centrifugal separator, and a collar (small) mounted on the rotating shaft. The collar (small) is located inside the centrifugal separator and cannot be seen visually.

[0058] Fig.19 (A) is a cross-sectional view of another embodiment of the inner wall member of the processing chamber, Fig.19 (B) is a three-dimensional view of the cylindrical surface constituting the inner surface of the inner wall member, Fig.19 (C) is a bottom view of the inner wall component.

[0059] Fig. 20 is a cross-sectional view of yet another embodiment of an inner wall member of a processing chamber.

[0060] Fig.21 It is a perspective view of a cylindrical surface of an inner wall member of a processing chamber on which a spiral groove is formed.

[0061] Fig. 22 FIG. 1 is a longitudinal sectional view of a processing chamber showing another embodiment of a baffle.

[0062] Fig.23 It is a longitudinal sectional view of a processing chamber showing still another embodiment of the baffle.

[0063] Fig.24 (A) is a longitudinal sectional view of a processing chamber showing another embodiment of a baffle, Fig.24 (B) is Fig.24 (A) is an enlarged view of the main part.

[0064] Fig.25 It is a longitudinal sectional view of a processing chamber showing still another embodiment of the baffle.

[0065] Fig.26 It is a longitudinal sectional view of a processing chamber showing still another embodiment of the baffle.

[0066] Fig. 27 It is a longitudinal sectional view of a processing chamber showing still another embodiment of the baffle.

[0067] Fig.28 This is a longitudinal sectional view showing a processing chamber of a stirring device equipped with an end plate having a small diameter.

[0068] Fig.29 (A) is a top view of the end plate of the small diameter. Fig.29 (B) is a cross-sectional view of the small diameter end plate. Fig.29 (C) is a bottom view of the end plate of the small diameter.

[0069] Fig.30 This table shows the dispersion results when barium titanate (primary particle size: about 150 nm) was dispersed using the bead mill DAM-1 of the present invention and a conventional device.

[0070] Fig.31 This table shows the sedimentation velocity distribution results when barium titanate (primary particle size: about 150 nm) was dispersed using the bead mill DAM-1 of the present invention and a conventional device.

[0071] Fig.32This table shows the relationship between D50 and residence time and the relationship between viscosity and residence time when barium titanate was dispersed (with a binder) using the bead mill DAM-1 of the present invention and a conventional device.

[0072] Fig.33 This is a table showing the relationship between D50 and residence time when titanium oxide (primary particle size: 15 nm) was dispersed using the bead mill DAM-1 of the present invention and a conventional device.

[0073] Fig.34 This is a table showing the relationship between D50 and residence time when titanium oxide (primary particle size: 15 nm) was dispersed using the bead mill DAM-1 of the present invention and a conventional device.

[0074] Fig.35 This is a table schematically showing an example of the specifications of the bead mill of the present invention.

[0075] Description of Reference Numerals

[0076] 1: Wet bead mill;

[0077] 2: Processing room;

[0078] 3: Buffer room;

[0079] 5: baffle;

[0080] 12: Slurry passage. DETAILED DESCRIPTION

[0081] A wet bead mill that exhibits an excellent dispersing function will be described.

[0082] [Example]

[0083] The wet bead mill 1 has a processing chamber 2, a buffer chamber 3 arranged above the processing chamber 2, and a baffle 5 arranged between the processing chamber 2 and the buffer chamber 3 and having a circular central hole 4. The wet bead mill 1 has a rotating shaft 6 that penetrates the buffer chamber 3 in the up-down direction and extends to the inside of the processing chamber 2 through the central hole 4, and the rotating shaft 6 is connected to the rotating shaft 10 of the motor (not shown) via a pulley 7, a belt 8, and a pulley 9. An annular slurry passage 12 is defined between the central hole 4 of the baffle 5 and the outer peripheral surface of the collar (large) 11. The processing chamber 2 and the buffer chamber 3 are connected via the annular slurry passage 12. The portion of the rotating shaft 6 that extends upward compared to the buffer chamber 3 is composed of a circular cross-section portion 6a having a circular cross-section, and the circular cross-section portion 6a of the rotating shaft 6 is supported by radial bearings 13, 14, and 15 and can rotate freely. A mechanical seal 16 for sealing the rotating shaft 6 is engaged with the circular cross-section portion 6a of the rotating shaft 6. The mechanical seal 16 seals the buffer chamber 3 and the processing chamber 2. The portion of the rotating shaft 6 below the circular cross-section portion 6a is composed of a square cross-section portion 6b having an octagonal cross-section consisting of four long sides and four short sides. Fig.17 This is a photograph of the square cross-section portion 6b of the rotating shaft 6. Four slurry inlets 6c extending in the radial direction of the rotating shaft 6 are provided in the square cross-section portion 6b, and these slurry inlets 6c are connected to the slurry flow path 6d formed along the axis of the rotating shaft 6. The slurry flow path 6d extends to the upper end portion 6e of the rotating shaft 6, and is connected to the processing chamber 2 via the external piping 17, the pump 18, the external piping 19, and the sanitary check valve 20.

[0084] The processing chamber 2 of the wet bead mill 1 is divided by a baffle 5, an inner wall member 21 and a bottom plate 22. Fig. 9 As shown, the baffle 5 is a disc-shaped member having a central hole 4. A truncated cone-shaped annular conical surface 5b is formed in the center of the upper surface 5a of the baffle 5 and is continuous with the central hole 4. A hole 5c for feeding the object to be processed is formed on the side of the annular conical surface 5b. Figure 2 As shown in FIG. 1 , the truncated conical annular conical surface 5b is continuous with the truncated conical annular conical surface 23a of the inner wall member 23 that divides the inner surface 3a of the buffer chamber 3 described later, and a truncated conical annular conical surface 24 that is continuous with the slurry passage 12 is formed at the lower part of the buffer chamber 3. An annular concave curved surface 5e is formed at the back surface 5d of the baffle 5 at a position surrounding the central hole 4. The annular concave curved surface 5e is a slurry guide surface that generates a portion of the slurry stirred by the stirring device A rotating inside the processing chamber 2. Figure 2 As shown by the arrow in FIG. 5 , the slurry flows toward the inside of the processing chamber 2. The slurry guide surface, i.e., the annular concave curved surface 5e, Figure 2The flow of the slurry toward the inside of the processing chamber 2 as shown by the arrow is mixed with the flow of the slurry flowing out from the processing chamber 2 to the buffer chamber 3 through the annular slurry passage 12, thereby preventing the zirconia grinding beads and other grinding media (not shown) inside the processing chamber 2 from flowing out to the buffer chamber 3 through the slurry passage 12. In order to achieve this purpose, the slurry guide surface, that is, the concave curved surface 5e, needs to be inclined in the opposite direction to the flow direction of the slurry flowing out from the processing chamber 2 to the buffer chamber 3 through the slurry passage 12 near the central hole 4. Therefore, the slurry guide surface can be composed of a conical surface inclined toward the center hole 4 of the opening portion constituting the baffle 5 and toward the inside of the processing chamber 2.

[0085] Fig.10 It is a cross-sectional view of the deformed state of the baffle. Fig. 9 The baffle 5 is composed of one component, but Fig.10 The baffle 50 is integrated by a lower component 50a and an upper component 50b via a seal 50c. The lower component 50a has a central hole 50d and a slurry guide surface 50e, and the cross-sectional shape of the annular concave curved surface constituting the slurry guide surface 50e changes continuously. As a result, the mixing position of the slurry flow toward the interior of the processing chamber 2 and the slurry flow flowing out of the processing chamber 2 to the buffer chamber 3 through the slurry passage 12 can be continuously changed in the axial direction of the central hole 50d, thereby generating a slurry mixing area extending in the axial direction of the central hole 50d. The upper component 50b of the baffle 50 has a truncated cone-shaped annular conical surface 50f continuous with the central hole 50d of the lower component 50a. As shown Figure 2 As shown, the truncated conical annular conical surface 50b and the truncated conical annular conical surface 23a (see FIG. 2A ) of the inner wall member 23 of the buffer chamber 3 described later are connected. Fig.11 ) is continuous, and a truncated cone-shaped annular tapered surface 24 is formed at the lower part of the buffer chamber 3 and is continuous with the slurry passage 12. By forming the lower part 50a and the upper part 50b of the baffle 50 from different parts, the processing of the lower part 50a and the upper part 50b becomes easy, and in particular, the shape of the slurry guide surface 50e can be variously changed.

[0086] like Figure 5 As shown, the inner wall member 21 of the processing chamber 2 is a cylindrical member as a whole. The inner surface 21a of the inner wall member 21 is also composed of a cylindrical surface, and ten grooves 21b extending in the vertical direction are formed at regular intervals on the inner surface 21a. These grooves 21b are parallel grooves extending parallel to the rotation axis of the rotating shaft 6. In addition, these grooves 21b have a cross-sectional shape that is smoothly curved in a concave shape. Figure 4 As shown, the bottom plate 22 of the treatment chamber 2 is a circular plate. A circular slurry return hole 22a is formed in the center of the bottom plate 22, and the external pipe 19 is connected to the slurry return hole 22a via a sanitary check valve 20. Figure 2As shown, the outer side of the inner wall member 21 of the processing chamber 2 is covered by a cooling water jacket 21c. Figure 3 This is a diagram showing a bottom plate 1 a of the wet bead mill 1 as viewed from below the wet bead mill 1 .

[0087] A buffer chamber 3 is provided above the processing chamber 2. The buffer chamber 3 is divided by an inner wall member 23, a top plate 25, and an upper surface 5a of a baffle plate 5. Fig.11 As shown in FIG. 1 , the inner surface of the inner wall member 23 has a truncated cone-shaped annular conical surface 23a and a cylindrical surface 23b, and a circular opening 23c is formed at the lower end of the truncated cone-shaped annular conical surface 23a. As described above, the truncated cone-shaped annular conical surface 23a of the inner wall member 23 is smoothly continuous with the truncated cone-shaped annular conical surfaces 5b and 50f of the baffles 5 and 50, and a truncated cone-shaped annular conical surface 24 (see FIG. 24 ) continuous with the slurry passage 12 is formed at the lower part of the buffer chamber 3. Figure 1 and Figure 2 ).like Fig.12 As shown in FIG. 2 , the top plate 25 is composed of a disk-shaped member as a whole, and a circular through hole 25a is formed in the center thereof. Figure 2 and Fig.17 As shown, the lower end of the mechanical seal 16 is located in the circular through hole 25 a , and the square cross-section portion 6 b of the rotating shaft 6 protrudes downward from the center of the mechanical seal 16 .

[0088] like Figure 1 , Figure 2 , Fig.18 As shown in FIG. 1 , the stirring device A is composed of a wing disc 26 and an end disc 27. The wing disc 26 and the end disc 27 are engaged with the square cross-section portion 6b of the rotating shaft 6 and are arranged in the processing chamber 2. Figure 6 As shown, the wing disc 26 is in the shape of a disk as a whole, and four stirring blades 26b are formed on the upper surface 26a of the wing disc 26. These stirring blades 26b extend in the radial direction of the wing disc 26, and are inclined and protruded toward the slurry guide surfaces 5e and 50f of the baffles 5 and 50. A fitting hole 26c that fits with the square cross-section portion 6b of the rotating shaft 6 is formed in the central part of the wing disc 26, and an O-ring mounting groove 26d is also formed on the upper surface 26a of the wing disc 26 at a position surrounding the fitting hole 26c. Figure 7As shown, the end plate 27 is formed with four stirring blades 27c extending in the radial direction on its upper surface 27a and lower surface 27b respectively. Moreover, a plurality of through holes 27d opening on the upper surface 27a and lower surface 27b of the end plate 27 are formed in the area between the stirring blades 27c of the end plate 27. A fitting hole 27e that fits with the square cross-section portion 6b of the rotating shaft 6 is formed in the central portion of the end plate 27, and an O-ring mounting groove 27f is formed on the upper surface 27a of the end plate 27 at a position surrounding the fitting hole 27e. The reference numeral 27g indicates an insertion hole for a fixing bolt 28 that is threadedly coupled to a threaded hole formed on the lower end surface of the square cross-section portion 6b of the rotating shaft 6. The stirring device A, the collar (large) 11 and the centrifugal separation device B are fixed to the square cross-section portion 6b of the rotating shaft 6 by means of the fixing bolt 28.

[0089] Figure 8 1 shows a collar (large) 11 installed between the stirring device A and the centrifugal separation device B. The collar (large) 11 is composed of a cylindrical member as a whole, and a through hole 11a with a circular cross section is formed along its axis. An O-ring mounting groove 11c is formed at a position around the through hole 11a on the lower end surface 11b of the collar (large) 11. The square cross-section portion 6b of the rotating shaft 6 is inserted into the through hole 11a with a circular cross section.

[0090] Figures 13 to 16 Components of the centrifugal separator B disposed in the buffer chamber 3 are shown. The centrifugal separator B is located above the collar (large) 11 and is disposed at a position on the inner surface of the inner wall member 23 of the buffer chamber 3 that is opposite to the cylindrical surface 23b. The centrifugal separator B is composed of an upper member 29, a lower member 30, and a collar (small) 31. Fig.13 As shown, a central hole 29a is formed in the center of the upper member 29 for the square cross-section portion 6b of the rotating shaft 6 to fit in, and an annular convex portion 29c surrounding the central hole 29a is formed on the upper surface 29b of the upper member 29. An annular convex portion 29e surrounding the central hole 29a is formed on the lower surface 29d of the upper member 29, and four cutout portions 29f are formed on the annular convex portion 29e at positions corresponding to the four slurry inlets 6c of the rotating shaft 6. Twelve centrifugal blades 29g are formed on the lower surface 29d of the upper member 29 at a certain distance from the annular convex portion 29e. Fig.14 As shown in FIG. 1 , a central hole 30a is formed in the center of the lower member 30, into which the square cross-section portion 6b of the rotating shaft 6 is fitted, and an O-ring mounting groove 30c is formed on the upper surface 30b of the lower member 30 in a manner surrounding the central hole 30a. Twelve centrifugal blades 30d are formed on the upper surface 30b of the lower member 30 at a certain distance from the O-ring mounting groove 30c. The lower surface 30e of the lower member 30 is composed of a truncated cone-shaped annular conical surface 30f and a flat surface portion 30g parallel to the upper surface 30b. Fig.16As shown, an arc a is drawn with a certain radius r around a point R on a reference circle S assumed inside the upper member 29 and the lower member 30, and the centrifugal blades 29g of the upper member 29 and the centrifugal blades 30d of the lower member 30 are arranged so as to form a centrifugal separation passage P between the adjacent centrifugal blades 29g and 30d along the arc a. Fig.18 As shown, the upper member 29 and the lower member 30 are combined in a one-to-one abutment manner with the centrifugal blades 29g of the upper member 29 and the centrifugal blades 30d of the lower member 30, and a centrifugal separation passage P is defined between two adjacent centrifugal blades 29g and two adjacent centrifugal blades 30d. Fig.15 (A) and (B) show the collar (small) 31 disposed between the upper member 29 and the lower member 30. The collar (small) 31 is composed of a cylindrical member as a whole, and a through hole 31a of a circular cross section is formed in the center portion for inserting the square cross section portion 6b of the rotating shaft 6. An O-ring mounting groove 31b is formed in the through hole 31a. The upper surface 31c of the collar (small) 31 is composed of a plane, and the lower surface 31d of the collar (small) 31 is also composed of a plane. Fig.15 (C) is a diagram showing an embodiment in which a swastika-shaped groove 32c is formed on the flat upper surface 32a of the collar (small) 32 in a manner corresponding to the four slurry inlet ports 6c of the rotating shaft 6, and showing the arrangement relationship between the swastika-shaped groove 32c of the collar (small) 32 and the centrifugal blade 30d of the lower member 30. The existence of the swastika-shaped groove 32c prevents the pulverizing media (not shown) such as zirconia grinding beads that have not been centrifugally separated by the centrifugal separation passage P and have reached the vicinity of the collar (small) 32 from invading the slurry flow path 6d from the slurry inlet port 6c of the rotating shaft 6.

[0091] like Figure 2 , Fig.18 As shown, the reason why the outer diameter of the upper part 29 of the centrifugal separation device B is larger than the outer diameter of the lower part 30 is that by reducing the distance between the upper part 29 and the cylindrical surface 23b of the buffer chamber 3, the stirring force in the upper part of the buffer chamber 3 is increased, so that the pulverizing medium flowing into the buffer chamber 3 is not retained in the upper part of the buffer chamber 3.

[0092] In addition, the reason why a truncated cone-shaped annular conical surface 24 continuous with the slurry passage 12 is formed at the lower part of the buffer chamber 3 is as follows. The slurry flow rising from the processing chamber 2 to the buffer chamber 3 through the slurry passage 12 is a swirling flow along the circumferential surface of the collar (large) 11, and the swirling flow gradually becomes low speed as it rises along the annular conical surface 24 expanding upward, and its pressure is increased. Therefore, the pulverizing medium in the swirling flow settles due to its own weight and the pressure difference between the upper and lower parts of the annular conical surface 24, and moves toward the slurry passage 12. Therefore, if the wet bead mill 1 is stopped, it is hoped that the pulverizing medium reaches the slurry passage 12 along the annular conical surface 24, does not stay in the buffer chamber 3, and returns to the processing chamber 2 due to its own weight.

[0093] In addition, the reason for forming a plurality of grooves on the inner surface of the processing chamber 2 is that turbulence is generated near the grooves, and the interaction between the pulverizing media is increased due to the turbulence, and the pulverizing efficiency is improved. In particular, by making the grooves into a cross-sectional shape that is smoothly curved in a concave shape, the direction of the flow can be changed without significantly slowing down the circumferential speed, so that the circumferential flow can collide with the circumferential flow near the outlet of the groove, so that the interaction between the pulverizing media is increased. In addition, the speed of the pulverizing media is reduced by the collision of the flow near the groove, so that the flying of the pulverizing media can be prevented. In addition, due to the presence of the grooves, the area of ​​the inner surface of the processing chamber is increased, so the amount of work performed between the pulverizing media and the inner surface of the processing chamber is increased, and the pulverizing efficiency is improved. In addition, for difficult-to-process materials such as ceramics, it is not difficult to process them into a cross-sectional shape that is smoothly curved in a concave shape, and difficult-to-process materials can be used in the inner wall parts of the processing chamber. Moreover, the cross-sectional shape that is smoothly curved in a concave shape is superior to other shapes in terms of cleaning properties, wear resistance, and ease of processing at the corners.

[0094] Figures 19 to 21 Other embodiments of the inner wall member 21 of the processing chamber 2 are shown. Fig.19 This is an embodiment in which the grooves on the inner surface 21Aa of the inner wall member 21A are divided into an upper groove 21Ab and a lower groove 21Ac, and the phases of these grooves are shifted. Fig. 20 The feature of the present invention is that the grooves 21Bb of the inner surface 21Ba of the inner wall member 21B are inclined, and the inclined grooves 21Bb are located in a position where the phase of the lower part is earlier than the phase of the upper part along the rotation direction of the stirring device A. Thus, the pulverizing medium can be guided downwardly in the processing chamber 2. Fig.21 The feature of the present invention is that a groove 21Cb is formed spirally on the inner surface 21Ca of the inner wall member, and the spiral groove 21Cb extends from the upper part to the lower part of the processing chamber 2 along the rotation direction of the stirring device A. Thus, the processing chamber 2 can be guided downward.

[0095] Figure 22 to Figure 27 It is a figure which shows the deformation state of the baffle plate 5.

[0096] for Fig. 22 For the baffle 5A, the surface on the buffer chamber 3 side is composed of a plane, and the inner surface 3a of the buffer chamber 3 is cylindrical in the upper and lower ranges. Therefore, the pulverizing medium flowing into the buffer chamber 3 may be retained inside the buffer chamber 3. However, if the slurry passage 12A is used as a gap partition, the pulverizing medium can be prevented from flowing into the buffer chamber 3. In addition, a wire mesh (not shown) can be provided at the outlet of the slurry passage 12A on the buffer chamber 3 side to prevent the pulverizing medium from flowing out. Other structures and Figure 2 The same as the wet bead mill 1.

[0097] Fig.23 The baffle 5B is an embodiment in which the slurry passage 12B is used as a gap partition. Figure 2 The same as the wet bead mill 1.

[0098] Fig.24 The baffle plate 5C is characterized in that a branch passage BR having an inlet opening O1 of the slurry is formed on the slurry guide surface 5Ca and an outlet opening O2 of the slurry is formed on the slurry passage 12C, and a second slurry guide surface 5Cb is formed on the branch passage BR, and the second slurry guide surface 5Cb is inclined in the opposite direction to the flow direction of the slurry flowing out of the processing chamber 2 through the slurry passage 12C. Figure 2 The same as the wet bead mill 1.

[0099] Fig.25 The baffle plate 5D is characterized in that, in the cross section of the baffle plate 5D in the figure, the slurry guide surface extends linearly toward the slurry passage 12D. Figure 2 The same as the wet bead mill 1.

[0100] Fig.26 The baffle 5E is characterized in that a second crushing disk EX is provided in the middle of the slurry passage 12E, and a slurry guide surface 5Eb is also provided in the second processing chamber 2E that accommodates the crushing disk EX. In this embodiment, the slurry guide surface 5Ea of the processing chamber 2 and the slurry guide surface 5Eb of the second processing chamber 2E both extend linearly toward the slurry passage 12E. Other structures are similar to Figure 2 The same as the wet bead mill 1.

[0101] Fig. 27 The baffle plate 5F is characterized in that a slurry inflow space SP is formed above the slurry guide surface 5Fa of the processing chamber 2E, and a slurry guide surface 5Fb extending linearly toward the slurry passage 12E is also provided in the slurry inflow space SP. Figure 2 The same as the wet bead mill 1.

[0102] Fig.28 and Fig.29 1 is a diagram showing a modified form of the stirring device A of the wet bead mill 1. The blade disk 26A of the stirring device Aa shown in the figure is Figure 6 The end plate 27A is smaller than the wing plate 26A, and the stirring blade 27Ac of the end plate 27A is formed only on the side of the wing plate 26A. This can effectively prevent the pulverized medium from being rolled up to the upper part of the processing chamber 2. Figure 2 The same as the wet bead mill 1.

[0103] Fig.30This is a table showing the dispersion results when barium titanate (primary particle size: about 150 nm) is dispersed using the bead mill DAM-1 of the present invention and existing equipment. Regarding D50, the progress of DAM-1 is slow, but it shows micronization to the same level as existing equipment. In sharpness (D99-D1) / D50, DAM-1 shows a sharp particle size distribution. Moreover, in the viscosity transition, DAM-1 shows that the viscosity rises steadily. In short, the particle size distribution of DAM-1 is sharp, which means that the generation of particles is suppressed and coarse particles are reduced. In addition, DAM-1 suggests that the viscosity rises steadily, which suppresses the generation of particles. Therefore, DAM-1 can suppress the generation of particles and can perform uniform dispersion.

[0104] Fig.31 This is a table showing the sedimentation velocity distribution results when barium titanate (primary particle size: about 150 nm) is dispersed using the bead mill DAM-1 of the present invention and the existing equipment. According to the sedimentation velocity distribution results, in the existing equipment, coarse particles (possibly both untreated particles and agglomerated particles) always remain, but in DAM-1, a sharp distribution is formed within 17 minutes, and then reagglomeration occurs. Although appropriate condition setting is required, DAM-1 can disperse uniformly.

[0105] Fig.32 This is a table showing the relationship between D50 and residence time and the relationship between viscosity and residence time when barium titanate is dispersed (with a binder) using the bead mill DAM-1 of the present invention and the existing equipment. It can be understood from the two tables in the figure that the micronization of DAM-1 progresses quickly and the viscosity is not increased. In addition, it can be seen that if the existing equipment is changed to 11m / s, a significant increase in viscosity will occur, but in DAM-1, even at 11m / s, there will be no increase in viscosity. Therefore, according to DAM-1, high-quality dispersion can be performed while suppressing the generation of fine particles.

[0106] Fig.33 This is a table showing the relationship between D50 and residence time when titanium oxide (primary particle size: 15 nm) is dispersed using the bead mill DAM-1 of the present invention and the existing equipment. According to the table, even in the peripheral speed region where the existing equipment aggregates, it is possible to disperse without aggregation in DAM-1. Therefore, according to DAM-1, high-quality dispersion can be achieved while suppressing the generation of fine particles.

[0107] Fig.34 This is a table comparing the pulverizing performance when using the bead mill DAM-1 of the present invention and the existing equipment to pulverize calcium carbonate. The main purpose of the present invention is to provide a bead mill that can achieve high-quality dispersion. According to the tables in the figure, in the bead mill of the present invention, depending on the setting of its peripheral speed, it is possible to obtain the same pulverizing performance as the existing equipment.

[0108] Fig.35 This is a table schematically showing an example of specifications of the bead mill DAM-1 of the present invention.

[0109] Industrial Applicability

[0110] The bead mill of the present invention is a bead mill capable of achieving high-quality dispersion, and depending on the setting of its peripheral speed, the bead mill of the present invention can also achieve a pulverization performance equivalent to that of conventional equipment.

Claims

1. A wet bead mill, comprising: a processing chamber for accommodating a mixture of a slurry containing crushed material and a pulverizing medium; a stirring device for stirring the mixture by rotating in the processing chamber to perform a dispersion process and / or a decomposition and crushing process and / or a pulverizing process on the crushed material; a slurry passage having an opening in the processing chamber and leading the slurry to the outside of the processing chamber; characterized in that: A rotating shaft for rotating the stirring device is provided, a hole for inserting the rotating shaft is provided in the processing chamber, the rotating shaft extending through the hole to the interior of the processing chamber is connected to the stirring device, the slurry passage is divided along the outer side of the rotating shaft, a baffle is provided in the processing chamber, thereby generating a flow of a portion of the slurry stirred by the stirring device toward the interior of the processing chamber, and the baffle is used to mix the flow of the slurry toward the interior of the processing chamber with the flow of the slurry flowing out of the processing chamber through the slurry passage, thereby preventing the pulverizing medium from flowing out of the processing chamber through the slurry passage.

2. The wet bead mill according to claim 1, characterized in that The baffle plate has a slurry guide surface surrounding the opening of the slurry passage, and the slurry guide surface is inclined in a direction opposite to a flow direction of the slurry flowing out of the processing chamber through the slurry passage near the opening.

3. The wet bead mill according to claim 2, characterized in that The slurry guiding surface is composed of a concave curved surface.

4. The wet bead mill according to claim 2, characterized in that The slurry guide surface is formed of a conical surface that is inclined toward the opening toward the interior of the processing chamber.

5. The wet bead mill according to claim 2, characterized in that The baffle has a branch passage, which has an inlet opening for the slurry on the slurry guide surface and an outlet opening for the slurry in the middle of the slurry passage, and a second slurry guide surface is formed on the branch passage, and the second slurry guide surface is inclined in the opposite direction relative to the flow direction of the slurry flowing out of the processing chamber through the slurry passage near the outlet opening.

6. The wet bead mill according to any one of claims 1 to 5, characterized in that The stirring device has a wing plate opposite to the slurry guide surface and an end plate opposite to the bottom surface of the processing chamber, the wing plate has stirring blades extending in a radial direction and protruding toward the slurry guide surface, and the end plate has stirring blades extending in a radial direction and a plurality of through holes extending in an axial direction.

7. The wet bead mill according to claim 6, characterized in that The end disc has a smaller diameter than the wing disc.

8. The wet bead mill according to claim 7, characterized in that The agitating blades of the end plate are formed only on the wing plate side.

9. The wet bead mill according to claim 2, characterized in that The baffle defines a second processing chamber in the middle of the slurry passage, a second pulverizing disk is disposed in the second processing chamber, the second pulverizing disk is connected to the rotating shaft, and a slurry guide surface extending toward the slurry passage is formed in the second processing chamber.

10. The wet bead mill according to claim 1, characterized in that The baffle defines a slurry inflow space above the slurry guide surface of the processing chamber, and a slurry guide surface extending toward the slurry passage is formed in the slurry inflow space.

11. A wet bead mill, comprising: a processing chamber for accommodating a mixture of a slurry containing crushed material and a pulverizing medium; a stirring device for stirring the mixture by rotating in the processing chamber to perform a dispersion process and / or a decomposition and crushing process and / or a pulverizing process on the crushed material; a slurry passage having an opening in the processing chamber and leading the slurry to the outside of the processing chamber; characterized in that: A rotating shaft for rotating the stirring device is provided, a hole for inserting the rotating shaft is provided in the processing chamber, the rotating shaft extending through the hole to the interior of the processing chamber is connected to the stirring device, the slurry passage is divided along the side of the rotating shaft, a buffer chamber is provided in the processing chamber, the processing chamber and the buffer chamber are connected via the slurry passage, the slurry passage has a slurry inlet in the processing chamber, the slurry passage has a slurry outlet in the buffer chamber, and a pulverizing medium separation device for separating the pulverizing medium from the slurry is arranged in the buffer chamber.

12. The wet bead mill according to claim 11, characterized in that The buffer chamber is arranged above the processing chamber, and a cylindrical surface and a truncated conical surface extending in a mortar shape from the lower end of the cylindrical surface toward the slurry outflow outlet of the slurry passage are formed on the inner surface of the buffer chamber. The pulverizing medium separation device is constituted by a centrifugal separation device, and the centrifugal separation device is arranged at a position surrounded by the cylindrical surface of the buffer chamber, so that the upper outer diameter of the centrifugal separation device is larger than the lower outer diameter of the centrifugal separation device.

13. The wet bead mill according to claim 12, characterized in that The centrifugal separation device is provided with a swastika-shaped slurry passage.

14. The wet bead mill according to claim 11, characterized in that The pulverizing medium separation device is composed of a gap partition and / or a wire mesh that prevents the pulverizing medium from passing through.

15. The wet bead mill according to any one of claims 11 to 14, characterized in that The rotation shaft extends toward the inside of the processing chamber through the buffer chamber.

16. The wet bead mill according to claim 12 or 13, characterized in that: The rotating shaft extends into the interior of the processing chamber through the buffer chamber, and the rotating shaft is connected to the centrifugal separation device. A slurry flow path is formed on the rotating shaft for the slurry separated by the centrifugal separation device to flow in. The slurry flow path is connected to the processing chamber via an external pipe, and a pump is installed on the external pipe to return the slurry flowing into the slurry flow path to the processing chamber.

17. A wet bead mill, comprising: a processing chamber for accommodating a mixture of a slurry containing crushed material and a pulverizing medium; a stirring device for stirring the mixture by rotating in the processing chamber to perform a dispersion process and / or a decomposition and crushing process and / or a pulverizing process on the crushed material; a slurry passage having an opening in the processing chamber and leading the slurry to the outside of the processing chamber; characterized in that: The inner surface of the processing chamber is composed of a cylindrical surface, and a plurality of grooves are formed on the cylindrical surface at predetermined intervals. The plurality of grooves extend at a predetermined angle with respect to the axial direction of the rotating shaft of the stirring device.

18. The wet bead mill according to claim 17, characterized in that The plurality of grooves each have a cross-sectional shape that is smoothly curved in a concave shape.

19. The wet bead mill according to claim 17 or 18, characterized in that The plurality of concave grooves are respectively formed of parallel grooves extending parallel to the axis of the rotating shaft of the stirring device.

20. The wet bead mill according to claim 19, characterized in that The parallel grooves are divided into upper parallel grooves and lower parallel grooves, respectively, and the upper parallel grooves and the lower parallel grooves are arranged with phases staggered.

21. The wet bead mill according to claim 17 or 18, characterized in that The plurality of grooves are respectively formed of inclined grooves extending obliquely relative to the axial direction of the rotating shaft of the stirring device, and the inclined grooves are located at positions along the rotating direction of the stirring device where the phase of the lower portion of the inclined groove is earlier than the phase of the upper portion of the inclined groove.

22. The wet bead mill according to claim 17 or 18, characterized in that The groove is formed of a spiral groove wound around the rotating shaft of the stirring device, and the spiral groove extends from the upper part to the lower part on the inner surface of the processing chamber along the rotating direction of the stirring device.

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