JP6535306B2 - Stirring device - Google Patents

Description

  The present invention relates to a stirring device that causes a stirring shaft to perform a swinging motion.

  The stirring device 90 shown in FIG. 5 includes a cylindrical deflection holding portion 92 fixed to the stirring tank 91 at one end, and the hollow space of the bending holding portion 92 is formed in the upper lid 91 a of the stirring tank 91. It communicates with the shaft insertion port 91b. The stirring shaft 93 is inserted into the shaft insertion port 91 b and the flexure holding portion 92, and is fixed to the other end of the flexure holding portion 92. The axis B of the stirring shaft 93 is inclined with respect to the center line A of the stirring tank 91. An upper end portion of the stirring shaft 93 protrudes upward from the flexure holding portion 92 and is connected to the actuator 94.

  When the actuator 94 is actuated, the upper end of the stirring shaft 93 performs a circular motion on a plane perpendicular to the center line A of the stirring tank 91. By this circular motion, the stirring shaft 93 performs a so-called swing motion with the axially intermediate portion as a fulcrum C. That is, the stirring shaft 93 moves with the fulcrum C as the apex so as to brush the side surface of the cone whose generatrix is the axis B (however, the stirring shaft 93 does not rotate). The bending holding portion 92 is capable of bending and deforming according to the swinging motion of the stirring shaft 93.

  The fulcrum C is positioned in the hollow space of the deflection holding portion 92 in order to suppress the amount of deflection (the amount of deformation) of the deflection holding portion 92. In order to stabilize the behavior of the agitating shaft 93, the agitating shaft 93 is supported by a spherical bearing 95 arranged to align the bearing center with the fulcrum C. The spherical bearing 95 includes an inner ring 95 a fixed to the outer peripheral surface of the stirring shaft 93 and an outer ring 95 b for receiving the inner ring 95 a. The housing 96 is fixed to the upper lid 91a of the stirring tank 91, and the housing 96 has a mounting member 96a disposed above the flexible holding portion 92, and the cylindrical mounting member 96b is fixed to the mounting member 96a. ing. The mounting member 96b extends downward from the mounting member 96a and enters the hollow space of the flexure holding portion 92 from above, and an outer ring 95b is provided at the lower end portion of the mounting member 96b.

  The other end of the bending holding portion 92 is closed so as not to allow the inside of the stirring tank 91 to communicate with the outside of the apparatus. For this blocking, the stirring shaft 93 is provided with a cylindrical portion 93a. The cylindrical portion 93a extends upward from a position lower than the inner ring 95a in the outer peripheral surface of the stirring shaft 93, surrounds the main body of the stirring shaft 93 and the spherical bearing 95, and is fixed to the other end of the bending holding portion 92 There is. Thus, the spherical bearing 95 can be disposed in the space isolated from the inside of the agitating tank 91 while the spherical bearing 95 is disposed in the hollow space of the flexure holding portion 92 and the center of the bearing coincides with the fulcrum C.

JP, 2015-85218, A

  In the above-described conventional example, in order to close the other end of the flexure holding portion 92 while making the fulcrum C positioned in the flexure holding portion 92 coincide with the center of the bearing, a complicated structure is provided inside the flexure holding portion 92. ing. Specifically, the main body of the stirring shaft 93, the inner ring 95a of the spherical bearing 95, the outer ring 95b (mounting member 96b) of the spherical bearing 95, and the cylindrical portion 93b of the stirring shaft 93 are arranged in quadruple in the radial direction There is.

  For this reason, the main body of the stirring shaft 93 has to be smaller in diameter than the size of the flexure holding portion 92. If the stirring shaft 93 is thin, it will be difficult to use for a large volume of stirring. If the stirring shaft 93 is thickened, the flexure holding portion 92 is also enlarged. Then, since the amount of bending of the bending holding portion 92 during operation of the stirring device 90 becomes large, the durability of the bending holding portion 92 is deteriorated.

  In order to reduce the amount of deflection and to improve the durability, the mounting member 96b is elongated to arrange the spherical bearing 95 deeper in the deflection holding portion 92 and bring the fulcrum C closer to the center of the deflection holding portion 92. Is also conceivable. However, in this case, the radius of motion of the stirring shaft 93 is increased around the upper end portion of the mounting member 96b, so it is necessary to increase the diameter of the upper end portion of the mounting member 96b. Although the main body of the stirring shaft 93 remains thin, the quadruple structure mentioned above is enlarged, and the flexure holding portion 92 is further enlarged. Therefore, even if the spherical bearing 95 is disposed deeper, it is difficult to improve the durability of the flexure holding portion 92.

  Then, an object of this invention is to make compatible the fulcrum of a swing movement close to the center of a bending holding part, and the miniaturization of a bending holding part.

  The stirring device according to one aspect of the present invention includes a stirring vessel having a shaft insertion port formed therein, and a hollow space communicating with the shaft insertion port, and a flexible holding unit fixed to the stirring tank at one end. And a stirring shaft which is inserted into the shaft insertion port and the hollow space so as to project the base end portion to the outside of the stirring tank and the bending holding portion and is fixed to the other end of the bending holding portion; A bearing member for supporting the stirring shaft, wherein a fulcrum of the swinging movement is set in the hollow space of the flexible holding portion, and the bearing member includes a first bearing and a second bearing; One bearing and the second bearing are disposed outside the flexible holding portion.

  According to the above configuration, the quadruple structure as in the conventional example is not required. In the conventional example, although it was difficult to position the fulcrum deep in the flexure holding portion due to the restriction for avoiding the enlargement of the structure, the above configuration does not have such a restriction. Therefore, it is easy to arrange the fulcrum deeper, for example, in the vicinity of the center of the flexure holding portion, and it is possible to suppress the amount of bending of the flexure holding portion during operation of the stirring device.

  Since the complicated quadruple structure is not required, the main body of the stirring shaft can be made thicker than the conventional example while maintaining the size of the flexure holding portion equal to that of the prior art. In this case, since the stirring shaft can withstand large volumes of stirring, the size of the stirring tank can be increased.

  Conversely, the size of the flexure holding portion can be made smaller than that of the conventional example while maintaining the diameter of the main body of the stirring shaft equal to that of the conventional example. In this case, the amount of bending of the bending holding portion during operation of the stirring device can be suppressed. Further, the pressure resistance is improved along with the reduction of the surface area of the flexure holding portion and the diameter reduction in the horizontal cross sectional direction, and the flexure holding portion can endure the stirring process under high pressure.

  The bearing member includes first and second bearings disposed outside the flexure support. The first and second bearings can receive the load acting on the proximal end of the stirring shaft. Therefore, even if the spherical bearing whose bearing center is aligned with the fulcrum is omitted, the position of the fulcrum during the swing movement is stabilized.

  According to the present invention, it is possible to achieve both of bringing the fulcrum of the swinging motion close to the center of the flexure holding portion and miniaturizing the flexure holding portion.

It is a fragmentary sectional view which looked at a stirrer concerning a 1st embodiment from the front. It is an upper sectional view of a stirring device shown in FIG. FIG. 3A is a cross-sectional view showing the periphery of the first bearing, and FIG. 3B is a cross-sectional view showing the periphery of the second bearing. It is an upper sectional view of a stirring device concerning a 2nd embodiment. It is an upper sectional view of a stirring device concerning a conventional example.

  Hereinafter, embodiments will be described with reference to the drawings. The same or corresponding elements will be denoted by the same reference symbols throughout the drawings, without redundant description.

First Embodiment
(Constitution)
Stirring apparatus 1 shown in FIG. 1 is mainly used for stirring processing such as mixing or dissolving of liquid or slurry, dissolution, crystallization, concentration, slurry suspension and gas-liquid contact in production processes in the pharmaceutical or chemical field.

  The stirring device 1 includes a stirring tank 2. The stirring tank 2 is formed in a cylindrical shape, and the center line A of the stirring tank 2 is directed vertically. The shaft insertion port 3 is formed in the upper lid 4 (for example, the central portion thereof) of the stirring tank 2. The upper lid 4 is formed with, for example, a raw material input, a light window, and a nozzle 5 used for a manhole, and a bottom wall of the stirring tank 2 is an outlet for discharging a product obtained by the stirring processing from the stirring tank 2 6 is provided. A housing 7 is attached to the outer upper surface of the upper lid 4. The housing 7 includes a base 7a fastened to a mount 4a protruding upward from the upper lid 4, a support 7b extending upward from the base 7a, and an upper plate 7c fixed to the upper end of the support 7b. The upper plate 7 c is disposed substantially horizontally above the shaft insertion opening 3.

  The stirring device 1 is provided with a stirring shaft 8. The stirring shaft 8 is inserted into the shaft insertion port 3. The proximal end (upper end) protrudes outside (above) the stirring tank 2 and is positioned in the housing 7. The tip (lower end) is positioned inside the stirring tank 2. A stirring blade 9 may be provided at the tip of the stirring shaft 8, and the type of the stirring blade 9 is not particularly limited. The axis B of the stirring shaft 8 inclines with respect to the center line A of the stirring tank 2. In the present embodiment, as an example, the axis B intersects with the center line A, and the stirring shaft 8 performs so-called swinging motion with the point of intersection of the lines A and B as the fulcrum C. Stir the substance.

The stirring device 1 includes an actuator 10 and a transmission member 11. The actuator 10 is a source of power for causing the stirring shaft 8 to perform a swinging motion, and is an electric motor, for example. The transmission member 11 is a member for transmitting the motive power for causing the stirring shaft 8 to swing (that is, the power generated by the actuator 10) to the stirring shaft 8, and the output shaft of the actuator 10 and the stirring shaft 8 It is interposed between the proximal end. The transmission member 11 includes a transmission shaft 12 to which power is transmitted from an output shaft of the actuator 10, and a holder 13 fixed to the transmission shaft 12 and holding the proximal end of the stirring shaft 8. When the actuator 10 operates, the transmission shaft 12 is rotationally driven around its own axis (around the center line A), and the holder 13 rotates integrally with the transmission shaft 12.

  As an example of the arrangement, the actuator 10, which is an electric motor, is attached to the upper surface of the upper plate 7c, and the output shaft of the actuator 10 is disposed coaxially with the center line A of the stirring tank 2 with its tip facing downward. The transmission shaft 12 is directly connected to the output shaft of the actuator 10 and coaxially arranged with the center line A of the stirring shaft 2. The holder 13 is formed in a cylindrical shape opened downward, and the base end of the stirring shaft 8 is fitted into the holder 13 from below.

The stirring device 1 is provided with a flexure holding portion 14. The flexure holding portion 14 has a cylindrical shape with both ends open. The flexure holding portion 14 is disposed outside the stirring tank 2, housed in the housing 7, and disposed between the upper lid 4 and the transmission member 11 in the vertical direction. The flexure holding portion 14 is fixed to the stirring tank 2 at one end (lower end). The hollow space 15 of the flexure holding portion 14 communicates with the shaft insertion port 3 and the inside of the stirring tank 2. The stirring shaft 8 is also inserted into the hollow space 15. The proximal end portion of the stirring shaft 8 protrudes to the outside (upper side) of the flexure holding portion 14 and is held by the holder 13 of the transmission member 11. The stirring shaft 8 is fixed to the other end (upper end) of the bending and holding portion 14 and is elastically supported by the stirring tank 2 via the bending and holding portion 14. One end opening of the bending holding portion 14 is opened and connected to the shaft insertion port 3, and the other end opening is closed (details of the structure will be described later). Thereby, the inside of the stirring tank 2 is isolated from the outside while the nozzle 5 and the discharge port 6 are closed (for example, during the stirring process).

  The fulcrum point C of the swinging motion is set in the hollow space 15 of the flexure holding portion 14. On the other hand, unlike the conventional example shown in FIG. 5, the stirring device 1 of this embodiment does not include a spherical bearing in which the fulcrum C and the bearing center coincide with each other, and the flexure holding portion 14 has such a configuration. Does not contain spherical bearings. Instead, the stirring device 1 is provided with a first bearing 17 and a second bearing 18 as a bearing member 16 that supports the stirring shaft 8. Both the first bearing 17 and the second bearing 18 are disposed outside the flexure holding portion 14 (in particular, the outside opposite to the stirring tank 2). The first bearing 17 is interposed between the proximal end of the stirring shaft 8 and the holder 13 of the transmission member 11. The second bearing 18 is mounted on the transmission shaft 12.

  As shown in FIG. 2, the flexure holding portion 14 includes a cylindrical portion 21 made of an elastic body, one end flange 22 provided at one end (lower end) of the cylindrical portion 21, and the other end of the cylindrical portion 21. It includes the other end flange 23 provided at the (upper end). The cylindrical portion 21 is made of, for example, an elastic material such as ethylene propylene diene rubber, and the flanges 22 and 23 are made of, for example, a rigid material such as a general structural rolled steel. The cylindrical portion 21 has a cylindrical basic shape, and the hollow space 15 is formed inside the cylindrical portion 21. The flanges 22 and 23 are formed in a ring shape having a circular hole at the center. One end of the cylindrical portion 21 passes through the circular hole of the one end flange 22 downward, is folded back to the end face of the one end flange 22, and is joined to the end face. The other end of the cylindrical portion 21 also passes upward through the circular hole of the other end flange 23, is folded back to the end face of the other end flange 23, and is joined to the end face. The flexure holding portion 14 includes a bulging portion 24 radially bulging at an axially intermediate portion. The bulging portion 24 has a U-shaped cross section. In the present embodiment, the bulging portion 24 has one step, but the bending and holding portion 14 may have a plurality of bulging portions aligned in the axial direction.

  The one end flange 22 is coupled to a ring-shaped mounting member 25 installed on the upper end surface of the shaft insertion opening 3 by a bolt inserted vertically. The mounting member 25 is coupled to the mounting flange 26 installed in the shaft insertion port 3 by a bolt inserted in the vertical direction, and the flexible holding portion 14 is provided with the stirring tank 2 (the mounting member 25 and the mounting flange 26). It is fixed to the upper lid 4).

  A wedge member 27 is attached to the stirring shaft 8 so as to protrude radially outward from the outer peripheral surface. The outer edge portion of the wedge member 27 is overlapped with the outer edge portion of the other end flange 23, and both outer edge portions are held by the clip 28. Thus, the stirring shaft 8 is fixed to the other end of the flexure holding portion 14.

  A hat-like spacer 29 is internally fitted to the other end of the cylindrical portion 21 and externally fitted to the outer peripheral surface of the stirring shaft 8. The flange portion of the spacer 29 is sandwiched between the other end flange 23 and the wedge member 27, and the cylindrical portion of the spacer 29 is interposed between the inner peripheral surface of the cylindrical portion 21 and the outer peripheral surface of the stirring shaft 8. ing. A seal for sealing the clearance between the cylindrical portion and the inner peripheral surface of the cylindrical portion 21 is provided on the outer peripheral surface of the cylindrical portion, and the inner peripheral surface of the cylindrical portion is between the outer peripheral surface of the stirring shaft 8 and the like. A seal is provided to seal the clearance of the Thereby, the hollow space 15 and the inside of the stirring tank 2 are closed. The first and second bearings 17 and 18 are disposed above the wedge member 27, that is, in a space isolated from the inside of the stirring tank 2.

  The stirring shaft 8 includes a long shaft-like main body 31 and a cap 32 externally fitted to a base end (upper end) of the main body 31. The cap portion 32 is formed in a tubular shape whose one end is open. The cap portion 32 is coupled to the main body portion 31 with a bolt inserted in the direction of the axis B in a state where the main body portion 31 is fitted into the cap portion 32. The tip end of the cap portion 32 is abutted against a step or wedge member 27 formed on the main body portion 31. The wedge member 27 and the spacer 29 are attached to the main body 31.

  A bearing holder 33 is fixed to the upper plate 7 c of the housing 7. The bearing holder 33 is formed in a bowl shape. The transmission shaft 12 of the transmission member 11 is inserted into the bearing holder 33 and protrudes downward from the bearing holder 33. The holder 13 of the transmission member 11 has a top plate portion 13 a provided at the lower end of the transmission shaft 12 and a cylindrical portion 13 b extending downward from the top plate portion 13 a. In the present embodiment, the transmission shaft 12 is integrally formed with the top plate portion 13a, and the top plate portion 13a is coupled with the cylindrical portion 13b by bolts, but this structure is an example. In this structural example, after the assembly of the cylindrical portion 13b and the stirring shaft 8 is finished, the top plate portion 13a integral with the transmission shaft 12 is coupled to the cylindrical portion 13b with the stirring shaft 8. The top plate 13a is disposed vertically to the transmission member 11 and extends horizontally. The top plate portion 13 a is circular when viewed in the axial direction of the transmission shaft 12 (the extending direction of the center line A), but is eccentric with respect to the axis (center line A) of the transmission shaft 12. The center line of the cylindrical portion 13 b is inclined with respect to the axis (center line A) of the transmission shaft 12. The inner peripheral surface of the cylindrical portion 13b is circular when it has a cross section perpendicular to the center line of the cylindrical portion 13b. The base end of the stirring shaft 8 is fitted into the cylindrical portion 13b from below, and the axis B of the stirring shaft 8 is disposed coaxially with the central line of the cylindrical portion 13b. Slope against.

  The first bearing 17 is mounted on the outer peripheral surface of the cap portion 32 of the stirring shaft 8 and is held by the cylindrical portion 13 b of the holder 13. The second bearing 18 is mounted on the outer peripheral surface of the transmission shaft 12 and is held by the bearing holder 33. In the present embodiment, both the first bearing 17 and the second bearing 18 are constituted by a rolling bearing mechanism in which a plurality of rolling element groups are axially aligned.

  As shown in FIG. 3A, in the first bearing 17, the rolling bearing mechanism is constituted by two conical roller bearings 41 and 42. In the present embodiment, the tapered roller bearings 41 and 42 are both single row type. The tapered roller bearing 41 includes an inner ring 41a externally fitted to the outer peripheral surface of the stirring shaft 8 (cap portion 32), an outer ring 41b internally fitted to the inner peripheral surface of the holder 13 (cylindrical portion 13b), an inner ring 41a and an outer ring And a rolling element group 41c that can roll on the raceway surface 41b. The rolling element group 41c is composed of a plurality of conical rollers. The tapered roller bearing 42 similarly has an inner ring 42a, an outer ring 42b, and a rolling element group 42c. The contact angle α 41 of the tapered roller bearing 41 is the same as the contact angle α 42 of the tapered roller bearing 42.

  The first bearing 17 is configured by combining two conical roller bearings 41 and 42 in a back-to-back manner. In the illustrated example, the single-row tapered roller bearings 41 and 42 are in close contact with each other in the axial direction, but a spacer may be provided between the bearings 41 and 42. Since the back-to-back combination is performed, the operating point P41 of the tapered roller bearing 41 and the operating point P42 of the tapered roller bearing 42 are separated from each other, and the distance between the operating points P41 and P42 increases.

  The tapered roller bearing 41 is externally fitted to the cap portion 32, and the tapered roller bearing 42 is externally fitted to the cap portion 32 from above. The cap portion 32 has a step surface 32 a against which the inner ring 41 a of the tapered roller bearing 41 abuts in the axial direction, whereby the first bearing 17 is axially positioned with respect to the stirring shaft 8. A screw is cut on the outer peripheral surface of the cap portion 32 on the base end side of the tapered roller bearings 41 and 42 in a portion closer to the inner rings 41a and 42a, and a nut 43 is screwed there. By tightening the nut 43, the tapered roller bearings 41, 42 are fixed to the stirring shaft 8, and a preload can be applied to the tapered roller bearings 41, 42. Next, the stirring shaft 8 is inserted into the holder 13 with the first bearing 17 attached. The cylindrical portion 13b of the holder 13 has a removable bottom lid 13c, and the bottom lid 13c is removed when the stirring shaft 8 is inserted. The cylindrical portion 13b has a step surface 13d against which the outer ring 42b of the tapered roller bearing 42 abuts in the axial direction, whereby the stirring shaft 8 and the first bearing 17 move in the direction of the axis B of the stirring shaft 8 with respect to the transmission member 11. Is positioned at Thereafter, by attaching the bottom cover 13c, the outer rings 41b and 42b of the tapered roller bearings 41 and 42 are held between the bottom cover 13c and the step surface 13c, and the first bearing 17 is fixed to the transmission member 11 (holder 13). .

  As shown in FIG. 3B, also in the second bearing 18, the rolling bearing mechanism is constituted by two tapered roller bearings 46 and 47. The tapered roller bearing 46 is capable of rolling on the raceway surfaces of the inner ring 46a and the outer ring 46b that are in close contact with the outer peripheral surface of the transmission shaft 12, the outer ring 46b that is in close contact with the inner peripheral surface of the bearing holder 33, And a moving body group 46c, and the rolling element group 46c includes a plurality of conical rollers. Similarly, the tapered roller bearing 47 has an inner ring 47a, an outer ring 47b, and a rolling element group 47c. The contact angle α 46 of the tapered roller bearing 46 is the same as the contact angle α 47 of the tapered roller bearing 47, and the second bearing 18 is also configured by combining the two tapered roller bearings 46 and 47 in a back-to-back manner. Reference numerals P46 and P47 denote operating points of the tapered roller bearings 46 and 47, respectively.

  The method of assembling the second bearing 18 is also similar to that of the first bearing 17. The tapered roller bearings 46 and 47 abut on the step surface 12 a of the transmission shaft 12, and the nut 48 is screwed into a screw formed on the outer peripheral surface of the transmission shaft 12. Thereby, the tapered roller bearings 46 and 47 are fixed to the transmission shaft 12. Next, the transmission shaft 12 is inserted into the bearing holder 33 in a state in which the second bearing 18 is mounted. The outer rings 46 b and 47 b of the tapered roller bearings 46 and 47 are axially held by the step surfaces 33 a and 33 b of the bearing holder 33. Thereby, the transmission shaft 12 and the second bearing 18 are positioned in the direction of the center line A with respect to the bearing holder 33 and fixed to the bearing holder 33.

(Action)
When the actuator 10 operates, the transmission shaft 12 is rotationally driven around the center line A, and the holder 13 rotates integrally with the transmission shaft 12. The stirring shaft 8 held by the holder 13 performs a swinging motion around the center line A with the point of intersection of its own axis B and the center line A as a fulcrum C. More specifically, the stirring shaft 8 moves on a plane orthogonal to the center line A so as to draw a circumference centered on the center line A. The upper part of the stirring shaft 8 above the fulcrum C moves so that the fulcrum C is at the top and the side of an inverted cone with the axis B of the stirring shaft 8 as a generatrix. The axis B of the stirring shaft 8 acts as a generatrix so as to brush the side of the cone. Together with the movement of the stirring shaft 8, the bending and holding portion 14 is repeatedly bent and deformed, and the stirring blade 9 is rotated in the stirring tank 2. The movement of the stirring shaft 8 and the stirring blades 9 stirs the substance in the stirring tank 2. During the stirring process, mainly the moment load and the radial load act on the stirring shaft 8. In order to support this load, a spherical bearing as in the conventional example is omitted, and the stirring device 1 is provided with a first bearing 17 and a second bearing 18 which are disposed outside (above) the flexure holding portion 14.

  The omission of the spherical bearing eliminates the need for providing a multiple structure as in the prior art (see FIG. 5) in the flexure holder. In the conventional example, it was difficult to position the fulcrum C deep in the flexure holding portion because of the restriction for avoiding the enlargement of the multiple structure, but in the present embodiment, such restriction is eliminated. Therefore, it is easy to arrange the fulcrum C deeper than in the conventional example, as shown in the figure, in the vicinity of the center of the flexure holding portion 14. Therefore, the amount of bending of the bending holding portion 14 can be suppressed while the stirring device 1 is in operation.

  There is no need to provide a tubular portion for enclosing the main body portion 31 on the stirring shaft 8 without the need for a complicated multiple structure. Therefore, as shown in FIG. 2, the main body portion 31 of the stirring shaft 8 can be made thicker than that of the conventional example while maintaining the size of the flexure holding portion 14 equal to that of the conventional example. In this case, since the stirring shaft 8 can endure large volumes of stirring, the size of the stirring tank 2 can be increased.

  Conversely, while maintaining the diameter of the main body portion 31 of the stirring shaft 8 equal to that of the conventional example, the size (particularly, the radial dimension) of the flexure holding portion 14 can be smaller than that of the conventional example. In this case, the amount of bending of the bending holding portion 14 can be suppressed while the stirring device 1 is in operation. Further, while the stirring process under high pressure is performed, the high pressure in the stirring tank 2 is applied to the inner circumferential surface of the cylindrical portion 21 of the bending and holding portion 14. When the bending and holding portion 14 is miniaturized, the pressure resistance of the bending and holding portion 14 is improved as the surface area of the bending and holding portion 14 decreases and the diameter in the horizontal cross-sectional direction decreases. The flexure holder 14 can withstand the stirring process under high pressure.

  Since the mounting member 96a (see FIG. 5) for supporting the spherical bearing can also be omitted, the axial length of the agitating shaft 8 (particularly, the axial length of the portion protruding from the flexure holding portion 14) is shortened. This contributes to the axial miniaturization of the stirring device 1.

  Instead of discarding the spherical bearing, the stirring device 1 is provided with a first bearing 17 and a second bearing 18 which are disposed outside the flexure holding portion 14 as a bearing member 16 for supporting the stirring shaft 8. The first bearing 17 is interposed between the stirring shaft 8 and the holder 13 for holding the base end thereof, and the second bearing 18 is mounted on the transmission shaft 12. The provision of these two bearings 17 and 18 makes it possible to stabilize the position of the fulcrum during the swing movement even if the spherical bearing whose center is aligned with the fulcrum is omitted. In particular, since both the first bearing 17 and the second bearing 18 are constituted by a rolling bearing mechanism in which a plurality of rolling element groups are arranged in the axial direction, the load capacity is large and the stirring shaft 8 is supported at the base end. Even if it does, the behavior of the stirring shaft 8 can be stabilized.

  During the stirring process, a large moment load acts on the stirring shaft 8 by the reaction force when the stirring blade 9 pushes the substance. In particular, the distance from the fulcrum C to the proximal end of the agitating shaft 8 (in particular, the portion received by the holder 13) is shorter than the distance from the fulcrum C to the agitating blade 9, and the proximal end of the agitating shaft 8 is A large moment load easily acts due to the ladder principle. The first bearing 17 is configured by combining two conical roller bearings 41 and 42 in back-to-back alignment, and the second bearing 18 is also configured by combining two conical roller bearings 46 and 47 in back-to-back alignment. Therefore, the distance between the action points P41 and P42 can be increased in the first bearing 17, and a large moment load can be supported by the first bearing 17. The distance between the action points P46 and P47 can be increased also in the second bearing 18, and a large moment load can be supported also in the second bearing 18. Further, both of the first bearing 17 and the second bearing 18 can apply a radial load and an axial load. By adopting such a configuration for the first bearing 17 and the second bearing 18, the behavior of the stirring shaft 8 can be stabilized.

Second Embodiment
FIG. 4 is a top cross-sectional view of the stirring device 51 according to the second embodiment. The second embodiment differs from the first embodiment in that the flexure holding portion 64 is realized and configured by a bellows, and the flexure holding portion 64 is disposed inside the stirring tank 52. Hereinafter, the second embodiment will be described focusing on this difference.

  As shown in FIG. 4, the bending and holding portion 64 is formed in a cylindrical shape having a lower opening at one end (upper end) and the lower end (lower end), and the peripheral wall portion is repeatedly uneven. When the flexure holding portion 64 is realized by such a bellows, resin such as PTFE or PP, rubber, metal or the like can be used as the material of the flexure holding portion 64.

The bending holding portion 64 is fixed to the stirring tank 52 at one end (upper end), and the other end (lower end) of the bending holding portion 64 is positioned in the stirring tank 52. The stirring shaft 58 is inserted into the hollow space 65 of the bending and holding portion 64, and the base end of the stirring shaft 58 protrudes outside (above) the bending and holding portion 64 and is held by the holder 13 of the transmission member 11. The stirring shaft 58 is fixed to the other end (lower end) of the bending and holding portion 64, and is elastically supported by the stirring tank 52 via the bending and holding portion 64. One end opening (upper end opening) of the flexure holding portion 64 is opened and connected to the shaft insertion port 53, while the other end opening (lower end opening) is closed. The hollow space 65 of the flexure holding portion 64 communicates with the shaft insertion port 53 of the stirring tank 52 and, in turn, the outside (upper side) of the stirring tank 52. One end of the bending and holding portion 64 is in close contact with the stirring tank 52 via a seal, and the other end of the bending and holding portion 64 is in close contact with the stirring shaft 58 via the seal. Thereby, the other end opening of the bending holding portion 64 is closed, and the hollow space 64 of the bending holding portion 64 is isolated from the inside of the stirring tank 52. As the seal, for example, an O-ring or a gasket can be applied. The method of fixing one end of the bending holding portion 64 to the stirring tank 52 and the method of fixing the other end of the bending holding portion 64 to the stirring shaft 58 are not particularly limited, and for example, screwing may be used. Further, although not shown in detail, there is provided an anti-rotation mechanism for preventing the flexure holding portion 64 from rotating with respect to the stirring shaft 64 at the time of the swinging motion of the stirring shaft 58. It is reduced.

  Also in this embodiment, the fulcrum point C of the swinging motion is set in the hollow space 65 in the bending and holding portion 64. The stirring device 51 does not have a spherical bearing in which the fulcrum C and the bearing center coincide with each other, and instead, a bearing member 16 (first bearing 17 and second bearing 18) supporting the stirring shaft 58 in the same manner as the first embodiment. ). For this reason, the same effect as that of the first embodiment can be obtained. In the present embodiment, since the fulcrum C is positioned in the stirring tank 52, the distance from the fulcrum C to the bearing member 16 is long. Therefore, the moment load acting on the base end of the stirring shaft 58 is reduced, which contributes to the miniaturization of the bearing member 16 and the holder for holding the same.

[Modification]
Although the embodiments have been described above, the above configuration can be added, changed or deleted within the scope of the present invention.

  For example, although the first bearing 17 is configured by two tapered roller bearings 41 and 42 combined in back-to-back alignment, it may be combined in front-to-face alignment, and instead of the tapered roller bearings, it is configured by angular ball bearings It is also good. In the first bearing 17, the contact angle α 41 of the tapered roller bearing 41 and the contact angle α 42 of the tapered roller bearing 42 are made the same, but the contact angle may be changed using tapered roller bearings of different sizes. The first bearing 17 is constituted by tapered roller bearings 41, 42 in which two rolling element groups 41c, 42c are axially aligned, but the number of rolling element groups aligned in the axial direction may be three or more. The first bearing 17 is constituted by two single-row conical roller bearings 41 and 42, but a double-row conical roller bearing in which two rolling element groups are arranged in the axial direction, a double-row angular ball bearing, Or it may be comprised by a ball bearing. The deformation of the first bearing 17 described above can be applied to the second bearing 18 as well. Only one of the first bearing 17 and the second bearing 18 may be configured by a rolling bearing in which a plurality of rolling elements are axially aligned. Moreover, the axis B of the stirring shaft 8 may not intersect with the center line A of the stirring tank 2, so that the fulcrum point C of the swinging motion is not limited to the intersection of the lines A and B. It should just be positioned. The flexure holding portion having the shape according to the first embodiment may be disposed inside the stirring tank as in the second embodiment, and the flexure holding portion having the shape according to the second embodiment is the second embodiment. As in one embodiment, it may be disposed outside the agitation tank.

DESCRIPTION OF SYMBOLS 1 Stirring device 2 Stirring tank 3 Shaft insertion port 8 Stirring shaft 11 Transmission member 12 Transmission shaft 13 Holder 14 Deflection holding portion 15 Hollow space 16 Bearing member 17 First bearing 18 Second bearing 41, 42, 46, 47 Conical roller bearing 41c , 42c, 46c, 47c Rolling element group α41, α42, α46, α47 Contact angle A Center line of stirring tank, axis B of transmission shaft B axis of stirring shaft C Support point of swinging motion

Claims (4)

A stirring vessel in which a shaft insertion port is formed;
A flexure holding portion having a hollow space communicated with the shaft insertion port and fixed to the stirring tank at one end;
A stirring shaft which is inserted into the shaft insertion port and the hollow space so as to cause a base end portion to protrude outside the stirring tank and the bending holding portion, and is fixed to the other end of the bending holding portion;
A bearing member for supporting the stirring shaft;
The stirring shaft moves such that a portion above the fulcrum sweeps the side surface of an inverted cone whose apex is the axis of the stirring shaft with the fulcrum at the top, and the stirring lower part of the stirring shaft makes the fulcrum at the top It is configured to perform a swinging motion that moves so as to stroke the side of a cone whose origin is the axis of the axis,
Wherein the fulcrum of the swinging motion is set to the hollow space of the deflection holding portion, the bearing member comprises a first bearing and second bearing, the first bearing and the second bearing, the deflection Stirring device disposed outside the holding unit. It further comprises a transmission member for transmitting the power for causing the swing motion to the stirring shaft,
The transmission member includes a transmission shaft that is rotationally driven, and a holder that holds the proximal end of the stirring shaft and rotates integrally with the transmission shaft.
The stirring device according to claim 1, wherein the first bearing is interposed between the base end of the stirring shaft and the holder, and the second bearing is mounted on the transmission shaft.   The stirring device according to claim 1, wherein at least one of the first bearing and the second bearing is configured by a rolling bearing in which a plurality of rolling element groups are axially aligned. 4. The device according to claim 1, wherein at least one of the first bearing and the second bearing is configured by combining two rolling bearings having a contact angle in a back-to-back manner. Stirring device.

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