(19)
(11)EP 3 733 272 A1

(12)EUROPEAN PATENT APPLICATION
published in accordance with Art. 153(4) EPC

(43)Date of publication:
04.11.2020 Bulletin 2020/45

(21)Application number: 18896921.6

(22)Date of filing:  29.08.2018
(51)International Patent Classification (IPC): 
B01F 7/16(2006.01)
B01F 7/18(2006.01)
B01F 7/00(2006.01)
H01M 4/04(2006.01)
(86)International application number:
PCT/JP2018/031851
(87)International publication number:
WO 2019/130654 (04.07.2019 Gazette  2019/27)
(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated Extension States:
BA ME
Designated Validation States:
KH MA MD TN

(30)Priority: 26.12.2017 JP 2017249592

(71)Applicant: Nakamura, Hiroki
Tokyo 170-0012 (JP)

(72)Inventor:
  • Nakamura, Hiroki
    Tokyo 170-0012 (JP)

(74)Representative: Zimmermann, Tankred Klaus et al
Schoppe, Zimmermann, Stöckeler Zinkler, Schenk & Partner mbB Patentanwälte Radlkoferstrasse 2
81373 München
81373 München (DE)

  


(54)DEVICE FOR MANUFACTURING SUSPENSION


(57) To provide a manufacturing device capable of manufacturing a less-impure suspension where there are no aggregates by uniformly mixing a plurality of materials.
A container 2 that accommodates electrode materials, a pair of first blades 4 attached, in a vertically separated manner, to a rotating shaft 3 extending in an up-down direction at a center of the container 2, and a second blade 5 arranged in the container 2 to surround the pair of first blades 4 are included. A first rotation means 11 rotationally drives the first blades 4. A second rotation means 12 rotationally drives the second blade 5 independently of the first blades 4. The second blade 5 includes vertical blade portions 5A each having a constant width in a radial direction of the container 2 and extending in the up-down direction, and horizontal blade portions 5B that respectively have end portions coupled to lower end portions of the vertical blade portions 5A, and other end portions inwardly extending in the radial direction, and that cause the electrode materials to flow upwardly. The first blades 4 are rotated faster than the second blade 5 to cause the electrode materials to flow in the up-down direction in the mixing container 2.




Description

Technical Field



[0001] The present invention relates to a device for manufacturing a suspension, and more particularly to a device for manufacturing a suspension used for manufacturing electrodes.

Background Art



[0002] A suspension made of electrode materials mixed together is commonly applied on a surface of an electrode substrate to form positive and negative electrodes of a secondary battery. For example, a suspension is applied on a surface of a metal foil to form positive and negative electrodes of a lithium ion secondary battery. Hereinafter, a suspension used for manufacturing electrodes is referred to as an electrode suspension.

[0003] A solvent and a powder material serving as an electrode material are mixed together to manufacture an electrode suspension of this type. That is, an electrode active material in the form of powder, a conductive material in the form of powder, and a binder in the form of powder are mixed together to form a powder material. A solvent is then brought into the mixture, i.e., the powder material. A rotating blade, for example, is used to mix together the solvent and the powder material to form an electrode suspension. Since properties of an electrode suspension greatly affect battery performance of a secondary battery, a process of uniformly mixing together electrode materials to manufacture a suspension is regarded as one of important processes in manufacturing electrodes and batteries. In such a process for manufacturing an electrode suspension, it is required to manufacture a less-impure suspension where there are no aggregates.

[0004] As one of such manufacturing devices, such a manufacturing device has been proposed that includes a mechanism that adjusts, through a drying method, a diameter of powder particles of a powder material used for an active material layer of a positive electrode of a battery, and a mechanism that mixes together a solvent and the powder material in which the diameter of powder particles has been adjusted (e.g., refer to Patent Literature 1).

Citation List


Patent Literature



[0005] Patent Literature 1: JP 2012-133931 A

Summary of Invention


Technical Problem



[0006] In the device described in Patent Literature 1, a diameter of powder particles of a powder material is adjusted, leading to complicated adjustments during manufacturing. The present invention provides a device for manufacturing a suspension, that manufactures a less-impure suspension where there are no aggregates, and that does not require such an adjustment of a diameter of powder particles as described above.

Solution to Problem



[0007] A device for manufacturing a suspension, according to one aspect of the present invention, is a device for manufacturing a suspension by mixing together a plurality of materials. The device includes a container that accommodates the materials, first blades rotatably arranged in the container, and a second blade rotatably arranged to surround the first blades. The second blade includes vertical blade portions that each have a predetermined width in a radial direction of the container, and that extend in an up-down direction, and horizontal blade portions respectively having end portions coupled to lower end portions of the vertical blade portions, and other end portions extending inwardly in the radial direction. The second blade has a predetermined clearance between each of the vertical blade portions and an inner side surface of the container.

[0008] According to the configuration, to uniformly mix together a plurality of materials, the first blades and the horizontal blade portions of the second blade cause the materials to flow in the up-down direction in the container. The first blades as well cause the materials to flow outwardly in the radial direction of the container. The clearance between each of the vertical blade portions of the second blade and the inner side surface of the container causes the materials to fully mix together. A less-impure suspension where there are no aggregates is therefore manufactured. As a result, to manufacture a suspension for electrodes, a less-impure electrode suspension is manufactured, contributing to improvements in battery performance, as well as to improvements in productivity through a shortened manufacturing time.

[0009] In the device for manufacturing a suspension, the second blade includes an attaching portion attached to the device, at a center of an upper portion, and coupling portions extending in the radial direction of the container to couple with each other the attaching portion and the vertical blade portions. According to the configuration, the attaching portion allows the second blade to be easily attached to the device. Adjusting the coupling portions in size allows the vertical blade portions to be easily adjusted in position.

[0010] In the device for manufacturing a suspension, the coupling portions, the vertical blade portions, and the horizontal blade portions of the second blade respectively form a pair. The pair of the coupling portions, the vertical blade portions, and the horizontal blade portions are arranged symmetrically around the attaching portion. According to the configuration, the pair of the coupling portions, the vertical blade portions, and the horizontal blade portions can uniformly and effectively mix together the materials.

[0011] In the device for manufacturing a suspension, the coupling portions in the pair extend symmetrically around the attaching portion and straightforward in the radial direction of the container. The coupling portions and the vertical blade portions are thus respectively smoothly coupled with each other. In such a configuration where the coupling portions each extend in the radial direction from the attaching portion at an angle, or the coupling portions and the vertical blade portions are each coupled at an angle, stress may be concentrated at a part during mixing, as well as an unintentional flow may occur during mixing. On the other hand, according to the above described configuration, it is possible to suppress stress from being concentrated, improving strength. It is also possible to suppress an unintentional flow from occurring, further uniformly and effectively mixing together the materials.

[0012] The device for manufacturing a suspension may be configured in such a manner that the second blade includes two pairs of the coupling portions, the vertical blade portions, and the horizontal blade portions, and the coupling portions, the vertical blade portions, and the horizontal blade portions are respectively arranged offset each at an angle of 90 degrees around the attaching portion. According to the configuration, the second blade includes the four coupling portions, the four vertical blade portions, and the four horizontal blade portions.

[0013] In the device for manufacturing a suspension, the horizontal blade portions of the second blade portion respectively have inclined surfaces inclined with respect to the vertical blade portions. According to the configuration, the materials are caused to effectively flow upwardly in the container, compared with a case where the horizontal blade portions of the second blade simply extend in a vertical direction. In a case where the first blades cause the materials to flow in an opposite direction, i.e., downwardly, the materials can be caused to collide with each other, effectively mixing together the materials.

[0014] In the device for manufacturing a suspension, the horizontal blade portions of the second blade respectively have openings at central portions. According to the configuration, by suppressing resistance while the horizontal blade portions are rotating, the materials can be effectively mixed together through smooth rotations, suppressing additional loads to be applied to the second blade.

[0015]  In the device for manufacturing a suspension, the horizontal blade portions of the second blade cause the materials to flow upwardly in the container. According to the configuration, the horizontal blade portions bring the materials upwardly. The first blades then bring the materials in a direction toward a wall surface of the container to bring the materials to the vertical blade portions that mix together the materials. Efficient mixing can thus be achieved.

[0016] In the device for manufacturing a suspension, the first blades respectively include inclined surfaces inclined with respect to the vertical direction of the container. The first blades cause the materials to flow upwardly or downwardly in the container. According to the configuration, the materials in the container are caused to effectively flow in the up-down direction, in addition to flow outwardly in the radial direction, compared with a case where the first blades simply extend in the vertical direction. Efficient mixing can thus be achieved.

[0017] The device for manufacturing a suspension includes a first rotation means that causes the first blades to rotate, a second rotation means that causes the second blade to rotate, and a rotation drive control means that controls the first rotation means and the second rotation means. The rotation drive control means causes the first blades to rotate faster than the second blade. According to the configuration, the first blades and the second blade are allowed to rotate at different speeds. For example, the first blades take a role of causing the materials to flow in the container. The second blade takes a role of causing the materials to mix together. The first blades and the second blade are thus allowed to rotate at different, but appropriate speeds, in line with the respective roles for effective mixing of the materials.

[0018] In the device for manufacturing a suspension, the rotation drive control means causes, to mix together the materials, the first blades and the second blade to rotate in directions opposite to each other to cause the first blades to generate a downward flow in the container. The rotation drive control means causes, to degas the materials, the first blades and the second blade to rotate in an identical direction to cause the first blades to generate an upward flow in the container.

[0019] According to the configuration, in a case where the horizontal blade portions of the second blade cause the materials to flow upwardly in the container, whereas the first blades cause the materials to flow in an opposite direction, i.e., downwardly, the materials can be caused to collide with each other, effectively mixing the materials. On the other hand, in a case where the first blades cause, together with the horizontal blade portions of the second blade, to cause a flow to occur upwardly, the materials are caused to flow upwardly in the container, effectively degassing the materials.

[0020] In the device for manufacturing a suspension, the rotation drive control means preferably causes the first blades to rotate at a speed falling within a range from 300 to 6000 rpm, and the second blade to rotate at a speed falling within a range from 1 to 180 rpm. The first blades are more preferably caused to rotate at a speed falling within a range from 600 to 1800 rpm. The second blade is more preferably caused to rotate at a speed falling within a range from 3 to 20 rpm.

[0021] In the device for manufacturing a suspension, the clearance preferably falls within a range from 2 to 100 mm. If the clearance is narrower than 2 mm, the suspension would rotate together with the blades, preventing the materials in various kinds from being fully mixed together. If the clearance is wider than 100 mm, the materials in various kinds would not also be effectively and fully mixed together. Advantageous Effects of Invention

[0022] To mix together a plurality of materials, under the present invention, the horizontal blade portions of the second blade cause the materials to flow upwardly. The first blades as well cause the materials to flow outwardly in the radial direction. The clearance between each of the vertical blade portions and the inner side surface of the container allows the materials to be uniformly mixed together. A less-impure suspension can thus be manufactured.

Brief Description of Drawings



[0023] 

FIG. 1 is a front view illustrating a schematic configuration of a device for manufacturing a suspension, according to an embodiment.

FIG. 2 is a perspective view illustrating the schematic configuration of the device for manufacturing a suspension, according to the embodiment.

FIG. 3 is a side view illustrating the schematic configuration of the device for manufacturing a suspension, according to the embodiment.

FIG. 4 is a plan view illustrating the schematic configuration of the device for manufacturing a suspension, according to the embodiment.

FIG. 5 is an explanatory view of an inlet/outlet portion for materials or a suspension into/from a container.

FIG. 6 is a front view illustrating a schematic configuration of a modified example of the device for manufacturing a suspension.


Description of Embodiments



[0024] An embodiment of the present invention will now be described below with reference to the accompanying drawings. However, the present invention is not limited to the embodiment. In the present embodiment, as an example, a device for manufacturing a suspension (hereinafter referred to as "electrode suspension") used for manufacturing electrodes of a battery will be in particular described. However, the present invention is not limited to the embodiment. The device is also applicable to suspensions used for other purposes than electrodes.

[1. Structure of manufacturing device]



[0025] FIG. 1 is a front view illustrating a schematic configuration of a device for manufacturing a suspension, according to an embodiment of the present invention. FIG. 2 is a perspective view of the device. As illustrated in FIGS. 1 and 2, a device 1 for manufacturing an electrode suspension includes, as main components, a container 2 that accommodates a plurality of electrode materials, a rotating shaft 3 extending in an up-down direction at a center of the container 2, and a pair of first blades 4, and a second blade 5.

[0026] The pair of first blades 4 are vertically arranged on the rotating shaft 3 at a predetermined gap. The second blade 5 is arranged in the container 2 to surround the pair of first blades 4. In the present embodiment, the first blades 4 form a pair. However, the present invention is not limited to the embodiment. Such a configuration may be applicable that includes the only one first blade 4, for example.

[0027]  The container 2 includes a container main body 2A having an opening that opens upwardly, and a lid portion 2B closing the opening of the container main body 2A. To mix together the electrode materials, the electrode materials are first filled to a position above the first blades 4. The container 2 is accommodated in a cooling container 21.

[0028] The first blades 4 each include four blade portions 4A. The four blade portions 4A are respectively attached, at intervals each at an angle of 90° in a circumferential direction, to outer peripheral portions of cylindrical portions 4B positioned at the center. The four blade portions 4A are also respectively attached in an inclined manner each at an angle of 45° with respect to axis lines of the cylindrical portions 4B. The blade portions 4A are mere examples of the present embodiment in terms of number and inclination angle. The present invention is not limited to the embodiment.

[0029] The rotating shaft 3 passes through the cylindrical portions 4B. The cylindrical portions 4B are attached to the rotating shaft. The first blades 4 cause the electrode materials to flow in the up-down direction in the container 2 in accordance with a rotation direction of the rotating shaft 3. The first blades 4 as well cause the electrode materials to flow outwardly in a radial direction of the container 2. The blade portions 4A as described above are respectively arranged to form a cross shape in a plan view. The blade portions 4A respectively arranged to form a cross shape are mere examples of the present embodiment. The present invention is not limited to the embodiment.

[0030]  Dimensions of the first blades 4 and the container 2 each preferably fall within a range calculated from an expression described below, in manufacturing a suspension. In here, an expression 1 described below represents a relationship between a length a in a horizontal direction of each of the blade portions 4A of the first blades 4 and an inner diameter D of the container main body 2A of the container 2.



[0031] An expression 2 described below represents a relationship between a height b in a vertical direction of each of the blade portions 4A of the first blades 4 and a height L of the container main body 2A of the container 2.



[0032] An expression 3 described below represents a relationship between the inner diameter D and the height L of the container main body 2A of the container 2.



[0033] The second blade 5 includes two vertical blade portions 5A each having a constant width in the radial direction of the container 2 and extending in the up-down direction, and two horizontal blade portions 5B that respectively have end portions coupled to lower end portions of the vertical blade portions 5A, and other end portions inwardly extending in the radial direction, and that cause the electrode materials to flow upwardly. That is, the vertical blade portions 5A and the horizontal blade portions 5B are arranged at equal intervals each at an angle of 180 degrees in the circumferential direction to each form a straight line in a plan view (see FIG. 3).

[0034]  The vertical blade portions 5A and the horizontal blade portions 5B are mere examples of the present embodiment in terms of number and the form of the straight line. The present invention is not limited to the embodiment. Such a configuration may be applied, for example, that the four vertical blade portions 5A and the four horizontal blade portions 5B are arranged at equal intervals each at an angle of 90 degrees in the circumferential direction to form a cross shape in a plan view (see FIG. 6).

[0035] The vertical blade portions 5A are arranged to provide a clearance c between each of the vertical blade portions 5A and an inner peripheral surface of the container 2. Upper end portions are coupled to a mounting-purpose cylindrical portion 5D via inclined blade portions 5C extending inwardly in the radial direction and upwardly in an inclined manner. That is, the inclined blade portions 5C couple the vertical blade portions 5A and the mounting-purpose cylindrical upper portion 5D. The vertical blade portions 5A thus respectively extend smoothly from the inclined blade portions 5C.

[0036] The rotating shaft 3 extends to pass through the mounting-purpose cylindrical portion 5D. The rotating shaft 3 is then linked to a first rotation means 11 that causes the first blades 4 to rotate forward or backward as the rotating shaft 3 rotates. A shaft portion 5F having a circular cylindrical shape is coupled to the mounting-purpose cylindrical portion 5D. The shaft portion 5F is linked to a second rotation means 12 that causes the second blade 5 to rotate as the shaft portion 5F rotates.

[0037] The horizontal blade portions 5B respectively have the end portions that are coupled to the lower end portions of the vertical blade portions 5A and that are positioned adjacent to the inner peripheral surface of the container 2, and the other end portions that each have a width that is gradually narrowing, that extend in the horizontal direction, and that are coupled to a central shaft portion 5E positioned at the center of the container 2. The central shaft portion 5E is coaxial with the rotating shaft 3 of the first blades 4.

[0038] As illustrated in a side view in FIG. 4, the horizontal blade portions 5B respectively have inclined plate shapes each inclined at an angle of approximately 45° with respect to the vertical blade portions 5A, where openings 5Ba are respectively provided at central portions, to effectively cause the electrode materials to flow upwardly. The horizontal blade portions 5B are mere examples of the present embodiment in terms of inclination angle. The present invention is not limited to the embodiment. Lower surfaces of the horizontal blade portions 5B may be flat surfaces substantially parallel to an inner bottom surface on a lower side of the container 2.

[0039] A dimension of the second blade 5 preferably falls within a range calculated from an expression described below, in manufacturing a suspension. In here, an expression 4 described below represents a relationship between a width W1 of each of the vertical blade portions 5A of the second blade 5 and the inner diameter D of the container 2.



[0040] An expression 5 described below represents a relationship between the width W1 of each of the vertical blade portions 5A of the second blade 5 and the clearance c between each of the vertical blade portions 5A and the inner peripheral surface of the container 2.



[0041] A range that an expression 6 described below defines is preferable. A range that an expression 7 described below defines is more preferable.





[0042] In the present embodiment, the clearance c is specified to 20 mm, as an example. A clearance S between each of bottom surfaces of the horizontal blade portions 5B and the inner bottom surface of the container 2 preferably falls within a range of S = 2 to 50 mm, and more preferably is 15 mm.

[0043] The first rotation means 11 rotationally drives the first blades 4. The second rotation means 12 rotationally drives the second blade 5. The first rotation means 11 and the second rotation means 12 are linked to a rotation drive control means 13. The rotation drive control means 13 drives and controls the first blades 4 to rotate faster than the second blade 5.

[0044] The first rotation means 11 and the second rotation means 12 are respectively and independently controlled for rotations. That is, the rotation drive control means 13 causes, in accordance with viscosity and other factors of the electrode materials, the first blades 4 to rotate at a speed falling within a range from 300 to 6000 rpm, and the second blade 5 to rotate at a speed falling within a range from 0 to 180 rpm. The first blades 4 are preferably caused to rotate at a speed falling within a range from 600 to 1800 rpm. The second blade 5 is preferably caused to rotate at a speed falling within a range from 3 to 20 rpm.

[0045] The second rotation means 12 that causes the second blade 5 to rotate always causes an upward flow to occur in the container 2. The first rotation means 11 that causes the first blades 4 to rotate meanwhile selects an upward flow or a downward flow, depending on whether the electrode materials are to be mixed or degassed.

[0046] That is, to mix together the electrode materials, the first rotation means 11 causes the first blades 4 to rotate in a direction opposite to a rotation direction of the second blade 5 to cause a downward flow to occur in the container 2 as the first blades 4 rotate.

[0047] On the other hand, to degas the electrode materials, the first rotation means 11 causes the first blades 4 to rotate in a direction identical to the rotation direction of the second blade 5 to cause an upward flow to occur in the container 2 as the first blades 4 rotate.

[0048] As illustrated in FIG. 5, a valve means 31 provided at a lower portion of the container 2 is used to allow the electrode materials or an electrode suspension to enter or exit the container 2. The valve means 31 includes a coupling port 31a coupled to a non-illustrated storage tank for an electrode suspension, and a handle 31b that is manually operated to allow the electrode suspension, for example, to enter or exit. The configuration in which the valve means 31 is provided on a side at the lower portion of the container 2 is a mere example of the present embodiment. Such a configuration may be applied that the valve means 31 is provided on the lower side at the lower portion of the container 2.

[2. Operation]



[0049] Next, how the manufacturing device 1 operates, in particular, how the first blades 4 and the second blade 5 move, will be described. To mix together the electrode materials, the container 2 is first filled with the electrode materials. The first blades 4 and the second blade 5 are then operated. At this time, the first blades 4 and the second blade 5 are rotated in directions opposite to each other.

[0050] As a result, an upward flow of the electrode materials, which is generated by the horizontal blade portions 5B of the second blade 5 rotating at a low speed, collides with a downward flow generated by the first blades 4 rotating at a high speed, causing the flows to change in direction to generate an outward flow in the radial direction. The outward flow, as well as another outward flow in the radial direction, which is generated as the first blades 4 themselves rotate, both bring the electrode materials toward an inner peripheral surface side of the container 2. The clearance between each of the vertical blade portions 5A that are rotating and the inner peripheral surface of the container 2 then allows the materials to positively mix together to form a less-impure electrode suspension where there are no aggregates.

[0051] In particular, since the central shaft portion 5E to which the horizontal blade portions 5B are coupled is coaxial with the rotating shaft 3 of the first blades 4, a downward flow generated by the first blades 4 smoothly changes an upward flow generated by the horizontal blade portions 5B into an outward flow in the radial direction. It is therefore possible to improve not only a battery in characteristics, but also productivity through a shortened manufacturing time.

[0052] On the other hand, to degas the electrode materials, the first blades 4 and the second blade 5 are rotated in an identical direction. As a result, an upward flow of the electrode materials, which is generated by the horizontal blade portions 5B of the second blade 5 rotating at a low speed, is caused to flow further upwardly as the first blades 4 rotate at a high speed, allowing air in the electrode materials to evacuate into an upper space of the container 2 for degassing.

[0053] After the electrode materials are mixed together, are degassed, and then are further fully mixed together to form an electrode suspension, the electrode suspension is allowed to exit the valve means 31 and collected in the non-illustrated storage tank. Using the device for manufacturing an electrode suspension, according to the present embodiment, as described above, to mix together various kinds of electrode materials can uniformly mix the materials, compared with such a conventional device. Using an electrode suspension manufactured as described above improves battery performance.

[3. Other embodiments]



[0054] The preferred embodiment of the present invention has been described above with reference to the accompanying drawings. However, various additions, changes, or deletions can be made without departing from the spirit of the present invention. The two vertical blade portions 5A and the two horizontal blade portions 5B are provided in the above described embodiment. Such a configuration may be applied, for example, that the four vertical blade portions 5A are provided (see FIG. 6). Such a configuration may be applied that only one blade portion or six blade portions is or are provided. In the above described embodiment, the central shaft portion 5E to which the pair of the horizontal blade portions 5B are coupled has a cylindrical column shape. However, the present invention is not limited to the embodiment. Such a configuration may be applied that the central shaft portion has a rectangular column shape or a plate shape to which the pair of the horizontal blade portions 5B are smoothly joined.

[0055] The valve means 31 serves as an inlet/outlet of the container 2 in the above described embodiment, for example. However, the present invention is not limited to the embodiment. A pneumatic means can be used for automation. In this way, there is no dead space, eliminating residues. Such a configuration is effective, particularly for large devices with a capacity of at least 3000 liters, that a valve is mounted in a circumferential direction of a container. The configuration allows the valve to be open while blades are allowed to rotate, achieving smooth discharging with less residues at a bottom portion of the container.

[0056] The container according to the present embodiment has a bottomed circular cylindrical shape having the bottom surface substantially parallel to the ground. However, the present invention is not limited to the embodiment. A dish-shaped container having a bottom surface projecting downward may be used. Therefore, such configurations are also included within the scope of the present invention.

Reference Signs List



[0057] 
1
device for manufacturing electrode suspension
2
container
2A
container main body
2B
lid portion
3
rotating shaft
4
first blade
4A
blade portion
4B
cylindrical portion
5
second blade
5A
vertical blade portion
5B
horizontal blade portion
5Ba
opening
5C
inclined blade portion
5D
mounting-purpose cylindrical portion
5E
central shaft portion
11
first rotation means
12
second rotation means
13
rotation drive control means
21
cooling container
31
valve means



Claims

1. A device for manufacturing a suspension by mixing together a plurality of materials, the device comprising:

a container that accommodates the materials;

first blades rotatably arranged in the container; and

a second blade rotatably arranged to surround the first blades, the second blade including

vertical blade portions that each have a predetermined width in a radial direction of the container, and that extend in an up-down direction, and

horizontal blade portions respectively having end portions coupled to lower end portions of the vertical blade portions, and other end portions extending inwardly in the radial direction,

the second blade having a predetermined clearance between each of the vertical blade portions and an inner side surface of the container.


 
2. The device for manufacturing a suspension, according to claim 1, wherein the second blade includes

an attaching portion attached to the device, at a center of an upper portion, and

coupling portions extending in the radial direction of the container to couple with each other the attaching portion and the vertical blade portions.


 
3. The device for manufacturing a suspension, according to claim 2, wherein
in the second blade, the coupling portions, the vertical blade portions, and the horizontal blade portions respectively form a pair, and
the pair of the coupling portions, the vertical blade portions, and the horizontal blade portions are arranged symmetrically around the attaching portion.
 
4. The device for manufacturing a suspension, according to claim 3, wherein
the coupling portions in the pair extend symmetrically around the attaching portion and straightforward in the radial direction of the container, and
the coupling portions and the vertical blade portions are respectively smoothly coupled with each other.
 
5. The device for manufacturing a suspension, according to claim 3 or 4, wherein
the second blade includes two pairs of the coupling portions, the vertical blade portions, and the horizontal blade portions, and
the coupling portions, the vertical blade portions, and the horizontal blade portions are respectively arranged offset each at an angle of 90 degrees around the attaching portion.
 
6. The device for manufacturing a suspension, according to any one of claims 1 to 5, wherein, in the second blade, the horizontal blade portions respectively have inclined surfaces inclined with respect to the vertical blade portions.
 
7. The device for manufacturing a suspension, according to claim 6, wherein, in the second blade, the horizontal blade portions respectively have openings at central portions.
 
8. The device for manufacturing a suspension, according to any one of claims 1 to 7, wherein the horizontal blade portions of the second blade cause the materials to flow upwardly in the container.
 
9. The device for manufacturing a suspension, according to any one of claims 1 to 8, wherein the first blades respectively include inclined surfaces inclined with respect to a vertical direction of the container.
 
10. The device for manufacturing a suspension, according to any one of claims 1 to 9, wherein the first blades cause the materials to flow upwardly or downwardly in the container.
 
11. The device for manufacturing a suspension, according to any one of claims 1 to 10, further comprising:

first rotation means that causes the first blades to rotate;

second rotation means that causes the second blade to rotate; and

rotation drive control means that controls the first rotation means and the second rotation means, the rotation drive control means causing the first blades to rotate faster than the second blade.


 
12. The device for manufacturing a suspension, according to claim 11, wherein the rotation drive control means causes,

to mix together the materials, the first blades and the second blade to rotate in directions opposite to each other to cause the first blades to generate a downward flow in the container, and,

to degas the materials, the first blades and the second blade to rotate in an identical direction to cause the first blades to generate an upward flow in the container.


 
13. The device for manufacturing a suspension, according to claim 12, wherein the rotation drive control means causes

the first blades to rotate at a speed falling within a range from 300 to 6000 rpm, and

the second blade to rotate at a speed falling within a range from 1 to 180 rpm.


 
14. The device for manufacturing a suspension, according to claim 12, wherein the rotation drive control means causes

the first blades to rotate at a speed falling within a range from 600 to 1800 rpm, and

the second blade to rotate at a speed falling within a range from 3 to 20 rpm.


 
15. The device for manufacturing a suspension, according to any one of claims 1 to 14, wherein the clearance ranges from 2 to 100 mm.
 




Drawing






















Search report










Cited references

REFERENCES CITED IN THE DESCRIPTION



This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

Patent documents cited in the description