JP5984130B2 - Rotating stirring device and rotating stirring method - Google Patents

Description

The present invention relates to a rotary stirring device and a rotary stirring method used for stirring an object to be stirred (including polishing, defoaming, and pulverization by rubbing the objects to be stirred).

  Conventionally, as similar to the above-described rotary stirring device, for example, a revolution drive source and a revolution mechanism that revolves a stirring container containing an object to be stirred around the central axis in the vertical direction by the output of the revolution drive source And a rotation drive source, and a rotation mechanism for rotating the stirring vessel revolving around the central axis around the vessel central axis by the output of the rotation drive source. The stirring vessel is held in a state where the vessel central axis is inclined with respect to the revolution central axis, and the inclination angle can be changed (Patent Documents 1 to 3).

  The rotary stirring device having the above structure presses the object to be stirred against the inner wall of the stirring container by centrifugal force generated by revolving the container inclined with respect to the revolution center axis, and further rotates the stirring container. An object to be stirred in the stirring vessel is stirred.

JP 2007-245000 A (paragraphs 0010, 0017, FIG. 2) JP 2008-119603 A (paragraphs 0008 and 0027, FIG. 3) JP 2010-240579 A (paragraphs 0015 and 0018, FIG. 1)

  However, according to the conventional rotary stirring device described above, although the container center axis is inclined with respect to the revolution center axis, the revolution center axis is oriented in the vertical direction. The centrifugal force acting on the object does not change. Since there is no change, the object to be agitated is limited to a certain place on the bottom of the inner wall of the agitating container. The contact with only a certain part of the inner wall of the stirring vessel has a problem that stirring is not always sufficiently performed because the object to be stirred is merely idled on the spot, and a solution has been desired. The present invention has been made paying attention to the above-described conventional problems, and an object of the present invention is to provide a rotary stirring device and a rotary stirring method capable of obtaining a high-quality mixture by uniformly mixing an object to be stirred. To do.

  In order to achieve the above-described object, the inventor has conducted extensive research and as a result, the revolution axis in the conventional rotary stirring device that rotates and rotates is tilted with respect to the vertical direction, thereby bringing the stirring object into contact with the inner wall of the stirring vessel. Succeeded in expanding the range. The present invention has been made based on such knowledge. The details will be explained again. It should be noted that the definitions of terms used to describe the invention described in any one of claims 2 are as many as possible within the scope of their nature regardless of the description order, expression method, difference in invention category, etc. It shall apply also to invention of a statement.

(Characteristics of the invention of claim 1)
A rotary agitating apparatus according to the invention of claim 1 (hereinafter, referred to as “apparatus of claim 1” as appropriate) includes an outer frame that is rotatable with respect to a base portion, and an outer frame in a space surrounded by the outer frame. has an inner frame rotatable, against the frame, is surrounded by the frame to the container central axis while revolving on the frame integrally to the central axis of the stirring vessel containing the stirring object space by rotating the inner, a rotary stirring device for stirring the object agitation of the stirred vessel, a revolution drive source for rotating the frame, the center axis of the stirring vessel by the output of the revolution drive source A revolving mechanism that revolves around, a rotation drive source, a rotation mechanism that revolves the stirring vessel revolving around the central axis by the output of the rotation drive source, and the central axis in the direction of gravity. Rotate the outer frame to rotate in the direction to change the angle with respect to Characterized in that it comprises a driving source, a to. Here, an electric motor is generally used as the revolution drive source. In addition, for the revolution mechanism, for example, a system using an original vehicle and a slave vehicle using gear drive or friction drive, or a belt drive system using a belt and a pulley can be used. Furthermore, although the use of an electric motor or the like is not hindered as the rotation drive source, the revolution drive source can be used as the rotation drive source. Finally, as the revolving mechanism, a method using the original vehicle and the slave vehicle, a belt drive method, and other methods can be used for the rotation mechanism.

According to the apparatus of the first aspect, the stirring container rotates around the central axis of the container while revolving around the central axis. At this time, there is no change in the relative relationship between the central axis and the container central axis. The object to be stirred is pressed against the inner wall of the stirring container by the centrifugal force generated by revolving the stirring container, and further, the object to be stirred in the stirring container is stirred and mixed by rotating the stirring container. On the other hand, the container central axis order to rotate in a direction to change an angle relative to the direction of gravity (vertical direction), an amount corresponding the stirred product was subjected to the centrifugal force caused by the rotation spreads on the stirred vessel inner wall. That is, the contact area between the object to be stirred and the inner wall of the stirring container increases. Moreover, the force which acts on a to-be-stirred object by this rotation changes with revolution. This is because the relative relationship (angle) between the direction of the centrifugal force generated by the revolution and the direction of gravity changes on the revolution circle. The increase in the contact area and the change in the force acting on the object to be stirred have a positive influence on the stirring action. As a result, the object to be stirred can be homogeneously mixed to obtain a high-quality mixture.

(Characteristics of the invention described in claim 2)
The rotary stirring device according to the invention of claim 2 (hereinafter, appropriately referred to as “device of claim 2”) rotates the stirring vessel containing the object to be stirred around the central axis while revolving around the central axis. A rotating stirrer that stirs the object to be stirred in the stirring vessel, and includes a revolution driving source, a revolution mechanism that revolves the stirring vessel around a central axis by an output of the revolution driving source, and a rotation driving A rotation mechanism that rotates the stirring vessel that revolves around the central axis by the output of the rotation drive source, and rotates the rotation of the stirring vessel around the central axis of the vessel, and changes the relative relationship between the central axis and the central axis of the vessel comprising a shaft angle setting mechanism of the axis angle with respect to the gravity direction of the central axis can be changed set to a desired angle without the axis angle setting mechanism, said desired angles period the central axis in the range of to reciprocally tilting To let Forms wherein the are.

According to the apparatus of the second aspect, the stirring vessel rotates around the central axis of the vessel while revolving around the central axis. At this time, there is no change in the relative relationship between the central axis and the container central axis. The object to be stirred is pressed against the inner wall of the stirring container by the centrifugal force generated by revolving the stirring container, and further, the object to be stirred in the stirring container is stirred and mixed by rotating the stirring container. On the other hand, since the container central axis is inclined with respect to the direction of gravity (vertical direction), the object to be stirred spreads on the inner wall of the stirring container by the amount of the inclination. That is, the contact area between the object to be stirred and the inner wall of the stirring container increases. Moreover, the force which acts on a to-be-stirred object by inclination changes with revolution. This is because the relative relationship (angle) between the direction of the centrifugal force generated by the revolution and the direction of gravity changes on the revolution circle. The increase in the contact area and the change in the force acting on the object to be stirred have a positive influence on the stirring action. As a result, the object to be stirred can be homogeneously mixed to obtain a high-quality mixture. In addition, the reciprocal tilt of the central axis makes the change due to the revolution of the force acting on the object to be stirred more complicated. More complicated changes can increase the stirring efficiency.

(Characteristics of Claim 3 )
The rotary stirring device according to the invention of claim 3 (hereinafter referred to as “device of claim 3 ” as appropriate) is the device of claim 1 or 2 , and assists in crushing the object to be stirred in the stirring vessel. By providing a ball for performing, it functions as a ball mill.

According to the apparatus of the third aspect , in addition to the function and effect of the apparatus of the first or second aspect , when the object to be stirred is stirred, a ball is put together therewith to assist the grinding of the object to be stirred. Is called. Although the degree varies depending on the type and form of the object to be stirred, the stirring action usually involves a crushing action, and the crushing action is promoted by stirring with the balls.

  According to the present invention, a high-quality mixture can be obtained by uniformly mixing an object to be stirred. Therefore, it is possible to realize the efficiency of the agitation work and the improvement of workability, and it is possible to realize the reduction of the agitation cost.

It is a front view of the rotation stirring apparatus of the state which made the stirring container the substantially vertical direction. It is a top view of the rotation stirring apparatus of the state which made the stirring container the substantially horizontal direction. It is a front view of the rotary stirring apparatus shown in FIG. It is a graph which shows the particle size distribution of the silica powder used for the experiment example. It is a graph which shows the result of stirring experiment in the state shown in FIG. It is a graph which shows the result of stirring experiment in the state shown in FIG. It is a graph which shows the result of stirring experiment, rotating a stirring container.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “this embodiment” as appropriate) will be described with reference to the drawings.

(Schematic structure of the rotary stirring device)
The schematic structure of the rotary stirring device will be described with reference to FIG. The rotary stirring device 1 includes a base portion 3, a pair of support columns 5, 5, an outer frame 7, an inner frame 9, a plurality (here, two) of stirring containers 21 and 21, and a revolution drive source. 31, a center shaft 41, a revolution mechanism 51, a rotation drive source 61, a container center shaft 71, a rotation mechanism 81, and a shaft angle setting mechanism 91.

  The base portion 3 is a member placed on the installation floor, and can be configured by a member (here, an iron plate) having sufficient strength and weight. The support pillars 5 and 5 are a pair of metal vertically long rectangular pillars that stand opposite to each other with a predetermined interval on the base portion 3, and support the outer frame 7 via the shaft angle setting mechanism 91 therebetween. The support pillars 5 and 5 can be made of a synthetic resin other than metal, but must have a size and strength for supporting the outer frame 7.

(Outer frame and inner frame)
The outer frame 7 is a metal rectangular frame, and is attached to the support columns 5 and 5 by the action of a shaft angle setting mechanism 91 described later. This is a metallic rectangular frame of the inner frame 9. The inner frame 9 is formed in a size that can be rotated in a space surrounded by the outer frame 7.

(Structure of shaft angle adjustment mechanism)
The shaft angle setting mechanism 91 includes a bearing 93a, a bearing 93b, a bearing 93c, a rotating shaft 95a, a rotating shaft 95b, and a positioning mechanism 97. The bearing 93a is provided on one support pillar 5 (right in FIG. 1), the bearing 93b is provided on the other support pillar 5, and the bearing 93c is provided at a position facing the bearing 93b of the outer frame 7.

  The rotating shaft 95a is supported in the horizontal direction by a bearing 93a so as to be rotatable (rotatable and swingable) with respect to the support column 5. One end of the rotation shaft 95a is fixed to the outer frame so as not to rotate, and the other end is fixed to the circular support plate 97a so as not to rotate outside the support column 5. That is, the rotary shaft 95a rotates integrally with the outer frame 7 and the support plate 97a. Two (or more) positioning pins 97p and 97p are inserted into the support plate 97a in the circumferential direction from the outside (right side in FIG. 1) through the pin holes 97h and 97h, and the tip portions thereof are inward. It is configured to be able to protrude.

  The protruding tip portions of the positioning pins 97p, 97p are received in receiving holes 5h, 5h provided in the support column 5, whereby the rotational shaft 95a is positioned in the rotational direction. It is preferable that the number of receiving holes 5h be formed to be larger than the number of positioning pins 97p so that the receiving holes 5h to be used can be selected when positioning. This is because the position of the rotating shaft 95a in the rotational direction can be changed stepwise by selecting and using the receiving hole 5h. As a result, the rotational axis 95a can be positioned in the rotational direction after the axial angle of the container central axis 71 with respect to the gravitational direction is changed and set to a desired angle. Since the rotating shaft 95a is integral with the outer frame 7, the positioning of the rotating shaft 95a is the same as the positioning of the outer frame 7. Even if the axial angle is changed, the relative relationship between the central axis 41 and the container central axis 71 is not changed. The support mechanism 97a, the pin hole 97h, the positioning pin 97p, and the receiving hole 5h constitute the positioning mechanism 97 of this embodiment. The desired angle can be appropriately set according to differences in the type, form, properties, size, etc. of the object to be processed, the shape of the inner wall of the stirring vessel 21, and the rotational speed, for example.

(Modification of shaft angle adjustment mechanism)
The positioning by the positioning pin 97p cannot be changed once it is fixed, but it can be configured to continuously rotate or swing. Instead of the positioning pins 97p and the support plate 97a, for example, a stepping motor (not shown) is provided, and this is controlled to rotate 360 degrees or reciprocate within an appropriate angle. You can also

(Revolution drive source)
The rotating shaft 95b is supported by a bearing 93b and a bearing 93c so as to be coaxial with the rotating shaft 95a and to be rotatable with respect to both the support column 5 and the outer frame 7. The outer end of the rotating shaft 95b (the left end in FIG. 1) is fixed to the rotating shaft of the drive motor 31 that is a revolution drive source so as to be integrally rotatable. On the other hand, the other inner end of the rotary shaft 95b is fixed to the center of the drive disc 35 that rotates in the vertical direction inside the outer frame 7 so as to be integrally rotatable in a state where the central axes coincide. The central axis 41 of the rotating shaft 95b is made to coincide with the central axis of the rotating shaft 95a. When the drive motor 31 is rotated in this state, the rotation shaft 95b is rotatable with respect to both the support column 5 and the outer frame 7, so that the outer frame 7 itself does not rotate and only the drive disk 35 rotates. It is supposed to be.

(Revolution mechanism)
A rubber friction material 37 such as a bicycle tire is fixed to the entire circumference of the drive disk 35. The radius of the drive disc 35 or the radius including the friction material 37 is set to be longer than the length of the inner frame 9. This is for rolling contact with the outer edge of the contact disk 38 that horizontally rotates integrally with the inner frame 9 and transmitting the rotation to the contact disk 38. The contact disk 38 transmits the rotation to the inner frame 9 fixed integrally therewith . Thereby, the inner frame 9 revolves. These drive disk 35, contact disk 38 and inner frame 9 constitute a revolving mechanism 33 for revolving the stirring container 21. The inner frame shaft 39 is disposed at a position crossing the central axis 41 by a bearing 7 a, a bearing 7 b and an inner frame hollow shaft 7 c provided on the outer frame 7, and one end is fixed to the outer frame 7. The inner frame 9 is supported by the inner frame hollow shaft 7c and a bearing so that the inner frame 9 can rotate. Therefore, the rotation of the contact disk 38 rotates the inner frame shaft 39.

(Container central axis)
For convenience of explanation, the container central shaft 23 that rotates integrally with the stirring container 21 will be described first. The container center shaft 23 protrudes in the inner frame direction (vertical direction) from the upper and lower sides of each of the two stirring containers 21, 21, and each of the four inner frame bearings 9 a provided on the inner frame 9 faces the inner frame 9. And is supported rotatably. The axis of each container center shaft 23 is arranged so as to be orthogonal to the axis of the rotation shafts 95a and 95b.

(Rotation drive source)
The rotation drive source 61 corresponds to the drive motor 31 that is also a revolution drive source. The reason why the drive motor 31 is used as both the revolution drive source and the rotation drive source is that a single drive source requires a simple structure with fewer parts. This does not prevent the provision of a drive source for rotation different from the drive motor 31, and can be appropriately adopted as necessary.

(Rotation mechanism)
The rotation mechanism 63 includes, in addition to the drive disk 35, the contact disk 38, and the inner frame shaft 39 (so far, common with the revolution mechanism 33), each of two drive pulleys 65, driven pulleys 67, a connecting belt 69, It is comprised by. The drive pulley 65 is fixed to the inner frame shaft 39 so as to rotate integrally. The driven pulley 67 is fixed to the container center shaft 23 so as to rotate integrally. The connecting belt 69 is a belt that drives and connects the driving pulley 65 and the driven pulley 67. The rotation of the drive motor 31 eventually causes the inner frame shaft 39 to rotate, and accordingly causes the drive pulley 65 to rotate together with the inner frame shaft 39. The rotation rotates the driven pulley 67 via the connecting belt 69, and the stirring vessel 21 rotates (rotates) integrally therewith.

(Stirring container)
The stirring container 21 in the present embodiment is formed in a vertically long cylindrical shape, and is configured in a double structure including an outer container 25 and an inner container 27 housed in the outer container 25. The reason why the double structure is adopted is to increase the safety as compared with a single container, thereby making it possible to deal with various objects to be stirred. As long as safety can be ensured, there are no restrictions on the materials and processing directions constituting each container, but in this embodiment, the outer container 25 is made of metal and the inner container 27 is made of zirconia. . The outer container 25 includes a vertically long cylindrical container body 25a having a flat bottom portion and a lid portion 25b fixed to the upper end portion of the container body 25a so as to close the upper end opening. The inner container 27 includes a vertically long cylindrical container main body 27a having a round bottom, and a lid portion 27b fixed to the upper end of the container main body 27a so as to close the upper end opening. . In addition, the container center axis | shaft 23 is each provided so that the one may protrude from the bottom outer side of the container main body 25a, and the other one may protrude from a lid | cover part top plate. Note that a ball for pulverization (not shown) may be placed in the inner container 27 and stirred together with the object to be stirred. In this case, the rotary stirring device 1 functions as a ball mill.

(Operational effect of this embodiment)
According to the rotary stirring device 1 configured as described above, the stirring vessel 21 rotates around the central axis 71 of the vessel while revolving around the central axis 41. At this time, there is no change in the relative relationship between the central axis 41 and the container central axis 71. The object to be stirred is pressed against the inner wall of the stirring container by centrifugal force generated by revolving the stirring container 21, and the stirring object in the stirring container is further rotated to stir and mix the object to be stirred. On the other hand, since the central axis is inclined with respect to the direction of gravity (vertical direction), the object to be stirred spreads on the inner wall of the stirring container by the amount of the inclination. That is, the contact area between the object to be stirred and the inner wall of the stirring container increases. Moreover, the force which acts on a to-be-stirred object by inclination changes with revolution. This is because the relative relationship (angle) between the direction of the centrifugal force generated by the revolution and the direction of gravity changes on the revolution circle. The increase in the contact area and the change in the force acting on the stirring object positively affect the stirring action, and as a result, the stirring object can be homogeneously mixed to obtain a high quality mixture.

  Examples will be described with reference to FIGS. The stirring experiment performed in this example is dry pulverization using the rotary stirring device 1, and the axial angle of the stirring vessel 21 is set vertically (substantially vertical), horizontally (substantially horizontal), and rotated (continuously changed, that is, , Which is a three-dimensional rotation), and an experiment was conducted to compare the respective stirring results. Two zirconia containers (weight 324 g, volume 80 ml) were used as the stirring containers. As a grinding ball, 153 g of a zirconia ball having a diameter of 5 mm was put into each stirring vessel. The material to be stirred (the material to be ground) is a silica powder having a median diameter (average particle diameter) of 94.39 μm. 10 g was put into each container. The revolution speed of the stirring vessel 21 was 240 rpm, and the rotation speed was 103 rpm. The rotation time (stirring time) was 3 minutes. As the measuring apparatus, a laser analysis / scattering particle size analyzer “LA500” manufactured by HORIBA was used. The weather on the experiment day was fine, the temperature was 22 ° C., and the humidity was 62%. 5 to 7 show the particle size distribution of the silica powder when the axial angle is changed.

  The median diameter (median value) when stirring was performed with the shaft angle being substantially vertical was 66.41 μm (FIG. 5). It decreased by about 29.6% compared to 94.39 μm before stirring. Since the silica powder at this time stays at the bottom of the stirring vessel by the action of gravity, stirring is mainly performed at the bottom.

  The median diameter when stirring with the shaft angle being substantially horizontal was 49.44 μm (FIG. 6), which was about 47.6% less than before stirring. Compared to the case where it is almost vertical, it is reduced by an extra 18% because the contact area between the silica powder and the inner wall of the stirring vessel increases because the stirring vessel is made almost horizontal, which seems to have contributed to the reduction in particle size. . The agitation sound generated during the agitation was also larger in the horizontal direction than in the vertical direction, and it was confirmed that the impact was applied to the silica. When the stirring vessel was opened after stirring, a phenomenon of silica powder was observed. This was a phenomenon that was not seen when the sample was almost vertical, and it was visually confirmed that the particle size was further reduced by making it almost horizontal. There was almost no phenomenon of silica recondensing on the inner wall of the stirring vessel.

  The median diameter when the shaft angle was rotated further decreased to 42.23 μm. Compared to before stirring, the particle size is reduced by about 55.3%. It is presumed that the axial angle decreased more than in the horizontal direction due to the three-dimensional agitation combined with revolution and rotation due to the rotation of the axial angle, and as a result, the entire inner wall of the agitation vessel contributed to the agitation. Increasing the stirring time will result in a more noticeable particle size reduction. The agitation sound during rotation was larger than when it was almost horizontal, and it was confirmed by ear that the impact and shearing were intense. The behavior of the silica powder when the stirring vessel was opened became even more prominent than when it was almost horizontal. Also, no recondensation was observed.

  From the above, it was found that it is possible to more efficiently stir (reduce the particle size) by setting it to be substantially horizontal rather than being set to be substantially vertical, and to rotate it further. The difference between almost vertical and almost horizontal is the area of the inner wall of the stirring vessel that can contact the silica powder. Although it depends on the shape of the inner wall of the stirring vessel, it was found that the stirring efficiency can be increased by changing the shaft angle with respect to the vertical.

DESCRIPTION OF SYMBOLS 1 Rotation stirring apparatus 3 Base part 5 Support pillar 5h Receiving hole 7 Outer frame 7a, 7b Bearing 7c Inner frame hollow shaft 9 Inner frame 9a Inner frame bearing 21 Stirrer container 23 Container center axis 25 Outer container 25a Container body 25b Cover part 27 Inner Container 27a Container body 27b Lid 31 Revolution drive source, rotation drive source (drive motor)
DESCRIPTION OF SYMBOLS 33 Revolution mechanism 35 Drive disk 37 Friction material 38 Contact disk 39 Inner frame axis 41 Center axis 61 Drive source for rotation 63 Rotation mechanism 65 Drive pulley 67 Driven pulley 69 Connection belt 71 Container center axis 91 Axis angle setting mechanism 93a, 93b , 93c Bearing 95a, 95b Rotating shaft 97 Positioning mechanism 97a Support plate 97p Positioning pin 97h Pin hole

Claims (3)

An outer frame rotatable relative to the base portion;
An inner frame rotatable with respect to the outer frame in a space surrounded by the outer frame,
By rotating in the space surrounded by the frame of the stirred tank to the container central axis while the central axis is revolved on the frame integrally housing the object to be stirred was to be stirred of the stirred vessel A rotary stirring device for stirring,
A revolution drive source for rotating the inner frame ;
A revolution mechanism for revolving the stirring vessel around a central axis by the output of the revolution drive source;
A drive source for rotation,
A rotation mechanism for rotating the stirring vessel that revolves around the central axis by the output of the rotation driving source;
A drive source for rotating the outer frame so as to rotate the central axis in a direction to change the angle with respect to the direction of gravity ;
A rotary stirrer characterized by comprising: A rotating stirring device for rotating the stirring vessel containing the stirring object around the central axis while revolving around the central axis and stirring the stirring object in the stirring vessel,
Revolving drive source,
A revolution mechanism for revolving the stirring vessel around a central axis by the output of the revolution drive source;
A drive source for rotation,
A rotation mechanism for rotating the stirring vessel that revolves around the central axis by the output of the rotation drive source,
An axis angle setting mechanism that enables the axis angle of the center axis to be changed to a desired angle without changing the relative relationship between the center axis and the container center axis;
The axis angle setting mechanism, rotary stirring apparatus characterized by the range of the desired angle have configured the central axis so as to cyclically reciprocating tilt. The rotary stirring device according to claim 1 or 2 , wherein the stirring vessel functions as a ball mill by providing a ball for assisting in crushing an object to be stirred.

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