JP2020049397A - Agitating blade and agitating device - Google Patents

Abstract

To provide an agitating blade that can drag in an object to be mixed to a tank bottom part side quickly so as to reduce time required for agitating.SOLUTION: An agitating blade 5 comprises a tabular main blade 51 supported on a rotary shaft 42 and auxiliary blades 52 provided at positions separated from the main blade 51 and the rotary shaft 42. The main blade 51 comprises first inclined edges 515 inclined in a direction in which the edges separate from the rotary shaft 42, from edges 513 of the main blade 51 at one end side of the rotary shaft 42 toward the other end side of the rotary shaft 42. The auxiliary blades 52 are extended to the one end side of the rotary shaft 42 more than trajectories that are formed by the first inclined edges 515 when rotating the rotary shaft 42.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a stirring blade and a stirring device.

  BACKGROUND ART Conventionally, as a stirring blade for stirring a mixture added to a fluid in a tank, a stirring blade provided with a main wing and an auxiliary wing is known (for example, see Patent Documents 1 and 2).

Japanese Utility Model Publication No. 7-34928 JP 2013-141635 A

  The conventional stirring blades described in Patent Literatures 1 and 2 have a problem in that the incorporation of the mixture from the vicinity of the liquid surface of the fluid to the tank bottom side is insufficient, and it takes a long time for stirring. Further, if the number of rotations is increased, it is possible to take in the mixture from the vicinity of the liquid surface of the fluid to the tank bottom side, but there is a problem that the damage of the mixture increases due to excessive shear stress.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a stirring blade and a stirring device that can rapidly pull a mixture to a tank bottom side without excessively generating shear stress, and can shorten the time required for stirring.

  The stirring blade of the present invention includes a flat main wing supported by a rotating shaft, and an auxiliary wing provided at a position separated from the main wing and the rotating shaft, wherein the main wing is provided at one end of the rotating shaft. A first inclined edge inclined in a direction away from the rotation axis from an end edge of the main wing toward the other end side of the rotation axis, wherein the auxiliary wing is configured to rotate the first rotation edge when the rotation axis is rotated. It is characterized by being extended to the one end side of the above-mentioned rotation axis rather than the locus which an inclined edge makes.

  According to the present invention, if the stirring blade is housed in the tank with one end of the rotating shaft being on the upper side and the other end of the rotating shaft being on the lower side, the stirring blade is separated from the rotating shaft from the upper edge toward the lower side. The fluid is pushed out in the radial direction of the rotating shaft by the main wing having the first inclined edge inclined in the direction in which the fluid flows, and the descending flow generated from the vicinity of the liquid surface to the tank bottom side so as to supplement the volume of the fluid. In addition, a swirl flow is generated in which the rotation of the main wing and the circumferential flow are combined. Since the auxiliary wing extends above the trajectory formed by the first inclined edge of the main wing when the rotation shaft is rotated, the swirl flow generated by the main wing is transmitted from above the trajectory of the first inclined edge. Promotes and amplifies the downdrafts that make up the swirl flow. Therefore, the mixture can be quickly drawn into the tank bottom without excessive shear stress, and the time required for stirring can be reduced.

  In the stirring blade according to the aspect of the invention, it is preferable that the auxiliary wing is disposed at a position of the auxiliary wing and inclined with respect to a tangent in the rotation direction when viewed from an axial direction of the rotation axis.

  According to the present invention, since the auxiliary wing is arranged to be inclined with respect to the tangent in the rotation direction when viewed from the axial direction of the rotation axis, the fluid can be efficiently moved in the rotation direction of the auxiliary wing. The time required for stirring can be further reduced.

  In the stirring blade of the present invention, the main wing is a second inclined edge inclined in a direction away from the rotation axis toward an end of the rotation shaft from an end edge of the main wing on the other end side of the rotation shaft. It is preferable to have.

  According to the present invention, the main wing has a second inclined edge inclined in a direction away from the rotation axis from the lower end edge, which is the other end side of the rotation axis, toward the upper end, which is the one end side of the rotation axis. Is provided, it is possible to amplify the upward flow from the tank bottom side toward the liquid surface side, and to promote the stirring at the tank bottom side.

  The stirring device of the present invention supplies a tank provided to be able to store a fluid, the above-described stirring blade stored in the tank, a driving unit that rotationally drives the stirring blade, and supplies the mixture to the tank. And a supply unit.

  According to the present invention, it is possible to obtain a stirring device capable of exhibiting the effect of the stirring blade described above.

  In the stirring device according to the aspect of the invention, it is preferable that the supply unit supplies a solid as the mixture.

  According to the present invention, since the supply section supplies the solid matter as the mixture, the solid matter can be taken into the fluid and stirred.

The side view of the stirring device provided with the stirring blade concerning one Embodiment of this invention. FIG. 2 is a side view of the stirring device in a state where a main wing of the stirring blade in FIG. 1 is facing the front. FIG. 3 is a plan view of the stirring device of FIG. 2. The figure which projected the state of the flow which generate | occur | produces in a stirring apparatus on the plane along a rotation axis. The side view of the stirring device concerning the modification of this invention. The side view of the stirring device concerning the modification of this invention. The top view of the stirring device provided with the stirring blade concerning the modification of this invention. The top view of the stirring device provided with the stirring blade concerning the modification of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
In FIG. 1, a stirrer 1 takes a mixture to be introduced into a fluid contained in a tank 2 and stirs the mixture to mix it with the fluid.

Here, the fluid refers to a viscous fluid such as a Newtonian fluid or a non-Newtonian fluid, a rheological fluid having viscoelasticity, a slurry-like fluid, a molten metal or plastic, etc. Material is not limited to this. In this embodiment, a medium or high viscosity fluid having an apparent viscosity of at least 100 mPa · s or more is used.
Further, the mixture may be a fluid or a solid, for example, a medium or high viscosity fluid, a low viscosity fluid, a rheological fluid or a slurry, a powder, a small solid, a sol or a gel. It may be a solid, a fiber, a bubble, an emulsion, or a mixture thereof, or a small solid that is easily damaged by shear stress.

  1 to 3, the stirring device 1 includes a tank 2, a supply unit 3, a driving unit 4, and a stirring blade 5.

  The tank 2 has a cylindrical shape with a bottom and an open top, and is provided so as to be able to store a fluid. The tank 2 includes a cylindrical side portion 21 and a bottom portion 22 connected to a lower end of the side portion 21. The bottom portion 22 has an inclined surface 221 whose diameter gradually decreases downward, and has a substantially truncated conical shape that is convex downward.

  The supply unit 3 is provided so as to supply the mixture to the tank 2. In the case of the present embodiment, the supply unit 3 supplies a solid material as a mixture.

The drive unit 4 includes a drive source 41 such as a motor, and a rotation shaft 42 that is rotated around the axis by the drive source 41, and drives the stirring blade 5 by the rotation shaft 42.
The driving source 41 is provided above the tank 2 and is directly connected to the upper end of the rotating shaft 42 or indirectly via driving force transmission means such as a gear (not shown).
The rotation shaft 42 is arranged along the axial direction of the tank 2.

The stirring blade 5 is supported by the rotating shaft 42 and is accommodated in the tank 2. The stirring blade 5 is housed so that the whole is located below the liquid level of the fluid in the tank 2 in order to prevent the mixture from adhering to the stirring blade 5. Further, the stirring blade 5 has an upper edge 513 located near the liquid surface and a lower edge 514 located in the bottom 22 of the tank 2.
The stirring blade 5 includes a flat main wing 51 supported by the rotating shaft 42, and an auxiliary wing 52 provided at a position separated from the main wing 51 and the rotating shaft 42.

  The main wing 51 includes a mounting portion 511 mounted on the rotating shaft 42 and a wing portion 512 supported by the mounting portion 511.

The mounting portion 511 is formed in a cylindrical shape having a through hole into which the rotating shaft 42 can be inserted, and is welded to the rotating shaft 42.
The wing portion 512 is provided along a plane including the rotation shaft 42. In the case of the present embodiment, the wing portions 512 are provided in pairs on both sides of the rotating shaft 42, and when viewed as a whole, the upper side, which is one end side of the rotating shaft 42, has the upper end edge 513 facing upward. The bottom has a substantially trapezoidal upward convex shape, and the lower end, which is the other end of the rotating shaft 42, has a substantially trapezoidal downward convex shape having the lower edge 514 as an upper base. Further, the wing portion 512 is provided with a slight gap between the wing portion 512 and the rotating shaft 42 in order to improve the cleaning performance of the stirring blade 5.
The wing portion 512 includes an upper edge 513, a lower edge 514, a first inclined edge 515, a side edge 516, and a second inclined edge 517.

The upper edge 513 is the edge of the upper main wing 51, and the lower edge 514 is the edge of the lower main wing 51. The upper edge 513 and the lower edge 514 extend in the width direction (hereinafter, simply referred to as the width direction) orthogonal to the rotation axis 42 along the wing portion 512, respectively.
The first inclined edge 515 is formed of a straight line connecting the widthwise outer edge of the upper edge 513 and the upper edge of the side edge 516, and extends away from the rotation shaft 42 downward from the upper edge 513. It is inclined.
The side edge 516 connects the lower end of the first inclined edge 515 and the upper end of the second inclined edge 517 and extends in parallel with the rotation shaft 42.
The second inclined edge 517 is formed of a straight line connecting the lower end of the side edge 516 and the outer end in the width direction of the lower edge 514, and approaches the rotation shaft 42 downward from the side edge 516. It is inclined in the direction, that is, in the direction away from the rotation shaft 42 from the lower edge 514 upward. In the case of the present embodiment, the second inclined edge 517 is disposed in the bottom 22 of the tank 2. The axial length of the wing portion 512 on the second inclined edge 517 side is shorter than the axial length of the region on the first inclined edge 515 side.

  The auxiliary wings 52 are provided on both sides of the rotating shaft 42, and are supported by the mounting portion 511 via the arms 521. The auxiliary wing 52 is formed in a flat plate shape parallel to the rotation shaft 42, and extends from a lower side than a trajectory formed by the first inclined edge 515 when the rotation shaft 42 is rotated to an upper side than the trajectory. I have. In addition, the auxiliary wing 52 is positioned at a position of the auxiliary wing 52 with respect to a tangent line TL (see FIG. 3) in the rotational direction of the rotary shaft 42 when viewed from the axial direction of the rotary shaft 42 (that is, simply referred to as an axial direction). The virtual circle CR centered on the axis 42 is arranged to be inclined with respect to the tangent line TL at the position of the auxiliary wing 52, and the front side in the rotation direction faces the inside of the virtual circle CR, and the rear side faces the outside of the virtual circle CR. ing.

In the above-described stirring apparatus 1, a procedure for taking the mixture to be mixed into the fluid, agitating the mixture to be mixed and mixing into the fluid will be described.
First, in a state where the fluid is accommodated in the tank 2, the rotation shaft 42 is rotationally driven by the driving source 41 to rotate the stirring blade 5. At this time, since the fluid is pushed out by the main wing 51 in a radial direction (hereinafter, simply referred to as a radial direction) orthogonal to the rotation shaft 42, the flow of the fluid is generated from both upper and lower directions so as to compensate for the volume of the fluid. . That is, as shown in FIG. 4, in the vicinity of the rotating shaft 42, an axial descending flow DF flowing from the vicinity of the liquid surface to the bottom 22 side of the tank 2 and an axial rising flow UF flowing from the bottom 22 of the tank 2 to the liquid surface side. Occurs.

  The axial descending flow DF and the axial ascending flow UF change directions at positions where they collide with each other, and form a flow that is directed radially outward of the tank 2 at a boundary surface between the two. The position at which this flow blows out from the rotation region of the main wing 51 is called a blowing point BP. The fluid ejected radially outward from the ejection point BP forms an ascending flow above the ejection point BP and a descending flow below the ejection point BP near the inner peripheral surface of the tank 2, as shown in FIG. Generate a circulating flow. These flows are only flow components projected on a plane parallel to the rotation axis 42, and the actual flow is a combination of these flow components and a circumferential flow generated by the rotation of the main wing 51. It becomes a swirling flow. When the mixture is supplied from the supply unit 3 into the tank 2 in this state, the mixture is taken into the fluid, stirred, and mixed with the fluid. That is, since the mixture can be drawn into the fluid from the liquid surface, the distribution of the mixture in the fluid can be made uniform, and the mixing property of the mixture with the fluid can be improved.

  Here, the transfer force of the mixture to the bottom portion 22 side of the tank 2 can be increased by gradually increasing the rejection flow rate of the fluid flowing radially outward from the rotation shaft 42 toward the bottom portion 22. That is, by forming the stirring blade 5 so that the rejection flow rate gradually increases toward the bottom portion 22, a strong axial downflow DF can be generated, and a strong drawing effect can be provided. For this reason, the width of the main wing 51 from the rotation shaft 42 to the side edge 516 is made larger than the length of the upper edge 513, and the radius of rotation of the main wing 51 is made larger on the lower side, so that the bottom 22 of the tank 2 is rejected. The flow rate is increased. The rejection flow rate is gradually increased toward the bottom portion 22 by forming the shape from the upper edge 513 to the side edge 516 to be continuous by the first inclined edge 515. Thereby, the shaft descending flow DF can reach further downward, and the transfer force of the mixture to the bottom 22 side can be increased.

  The strength of the transfer force of the mixture to the bottom 22 side of the tank 2 is correlated with the height of the ejection point BP (relative position with respect to the stirring blade 5). That is, when a strong axial descending flow DF is generated by the rotation of the stirring blade 5 and the transfer force of the mixture to the bottom 22 side is increased, the ejection point BP is located in a lower region of the stirring blade 5. The height of the ejection point BP can be set by an angle θ1 (refer to FIG. 2) between the first inclined edge 515 of the stirring blade 5 and the rotating shaft 42 (hereinafter, referred to as an inclined angle of the first inclined edge 515). . When the wing portions 512 have the same axial length, the larger the inclination angle of the first inclined edge 515 becomes θ1, the stronger the axial downflow DF occurs, and the ejection point BP moves to the bottom 22 side of the tank 2. I do. To increase the inclination angle θ1 of the first inclined edge 515, the length of the upper edge 513 may be reduced or the width from the rotation shaft 42 to the side edge 516 may be increased. The width up to the edge 516 must be smaller than the inside diameter of the tank 2. On the other hand, if the rotation radius of the main wing 51 near the liquid level is too small, it is difficult to generate a sufficient axial downflow DF to take the mixture into the fluid.

  For example, when the surface tension of the fluid is relatively small, or when the specific gravity of the mixture is larger than the specific gravity of the fluid, the required strength of the axial downflow DF is relatively weak. The length may be short. On the other hand, when the surface tension of the fluid is large, or when the specific gravity of the mixture is smaller than the specific gravity of the fluid and the mixture tends to float on the liquid surface of the fluid, the upper end edge 513 is made longer. Therefore, it is necessary to strengthen the capturing power. For this reason, it is preferable that the length of the upper end edge 513 is 10% or more and 60% or less of the inner diameter of the tank 2. Further, the inclination angle θ1 of the first inclined edge 515 is preferably 10 degrees or more, and more preferably 10 degrees or more and 50 degrees or less. The width from the rotation shaft 42 to the side edge 516 can be set wider than the upper edge 513 within a range that realizes the above-described inclination angle θ1, but the length is 40% or more and less than 100% of the inner diameter of the tank 2. Is preferred. The angle (hereinafter, referred to as the angle of inclination of the second inclined edge 517) θ2 formed by the second inclined edge 517 with the rotating shaft 42 (see FIG. 2) is larger than the angle of inclination θ1 of the first inclined edge 515, and the inclination of the tank 2 is increased. The angle formed by the surface 221 with the rotating shaft 42 (hereinafter, referred to as the angle of inclination of the inclined surface 221) θ3 (see FIG. 2) or is smaller than the angle of inclination θ3 of the inclined surface 221.

  Here, when the bottom portion 22 has a downwardly convex shape instead of being flat as in the tank 2, the fluid in the bottom portion 22 tends to stay. For this reason, by disposing the lower end of the main wing 51 in the bottom 22, the fluid in the bottom 22 is more likely to flow. Further, by gradually increasing the radius of rotation of the main wing 51 from the lower edge 514 to the side edge 516 by the second inclined edge 517 of the main wing 51, the rejection flow rate of the fluid is gradually increased toward the bottom 22, and from the bottom 22. Is amplified. Thereby, the fluid in the bottom portion 22 is moved toward the position of the ejection point BP, and the mixture is stirred more uniformly and mixed with the fluid.

  When the axial length of the region on the first inclined edge 515 side of the wing portion 512 is the same as the axial length of the region on the second inclined edge 517 side, the strength of the axial descending flow DF and the axial ascending flow UF is increased. At the height of the ejection point BP, the axial descending flow DF and the axial ascending flow UF do not pass up and down on each other's boundary surface, but remain independently on the radial outside of the tank 2. Will flow. Therefore, the wing portion 512 has different axial lengths in the region on the first inclined edge 515 side and the region on the second inclined edge 517 side, and balances the strength of the axial downflow DF and the axial upflow UF. By avoiding this, at the height position of the ejection point BP, a flow is formed that vertically passes through the boundary surface between the axial downflow DF and the axial upflow UF. As a result, the fluid can move up and down the boundary surface, so that the mixture can be uniformly stirred and mixed with the fluid.

Further, the stirring blade 5 is provided with an auxiliary blade 52, which promotes the axial downflow DF near the liquid level and promotes the swirling flow generated by the main blade 51. That is, by extending the auxiliary wing 52 from the lower side of the trajectory formed by the first inclined edge 515 to the upper side of the trajectory, the auxiliary wing 52 is located above the trajectory of the first inclined edge 515, that is, from the rotation area of the main wing 51. The liquid also repels the fluid on the liquid surface side and promotes the axial downflow DF near the liquid surface. As a result, the axial descending flow DF constituting the swirling flow is amplified to promote the swirling flow, and at the height position of the ejection point BP, the flow of the fluid flowing radially outward from the rotating shaft 42 is promoted. ing.
In addition, by arranging the auxiliary wing 52 at an angle with respect to the tangent line TL (see FIG. 3) in the rotation direction, the fluid efficiently moves in the rotation direction of the auxiliary wing 52, and the swirling flow is further promoted. Will be. The inclination angle θ4 of the auxiliary wing 52 with respect to the tangent line TL is preferably not less than 10 degrees and not more than 80 degrees, and more preferably not less than 15 degrees and not more than 45 degrees.
Further, by extending the auxiliary wings 52 above the locus formed by the first inclined edge 515, as shown in FIG. 4, the area near the liquid surface above the locus formed by the first inclined edge 515 is formed. In this case, a circulating flow that circulates in a region near the liquid level can be generated.
As a result, the mixture can be uniformly stirred in almost the entire area of the tank 2 and mixed with the fluid.

According to the above-described embodiment, the fluid is extruded in the radial direction of the rotating shaft 42 by the main wing 51 having the first inclined edge 515 inclined downward from the upper edge 513. A swirling flow is generated in which the axial downflow DF generated from the vicinity of the liquid surface toward the bottom 22 side of the tank 2 and the circumferential flow due to the rotation of the main wing 51 so as to compensate for the volume are combined. Since the auxiliary wing 52 extends above the trajectory formed by the first inclined edge 515 of the main wing 51 when the rotation shaft 42 is rotated, the swirl flow generated by the main wing 51 is generated by the first inclined edge 515. It accelerates from above the trajectory and amplifies the axial downflow DF constituting the swirling flow. Therefore, the material to be mixed can be quickly drawn into the bottom portion 22 of the tank 2 without generating excessive shear stress, and the time required for stirring and mixing can be reduced.
Therefore, for example, a medium- or high-viscosity fluid is stirred under relatively low-shear stirring conditions (for example, the rotation speed is about 30 to 300 RPM and the tip speed of the stirring blade 5 is about 1 to 5 m / s). Even in this case, the mixture can be rapidly and uniformly stirred and mixed with the fluid.
Further, even when the mixture is easy to float on the fluid, adheres easily to the inner wall of the tank 2 or the stirring blade 5, or easily aggregates due to swelling, the mixture is removed from the bottom 22 of the tank 2. The mixture can float on the liquid side, adhere to the inner wall of the tank 2 or the stirring blade 5, solidify the mixture that is not taken into the fluid while floating, or Can be prevented from dispersing sufficiently in the fluid to form a local lump.

  Further, since the auxiliary wings 52 are arranged obliquely with respect to the tangent line TL in the rotation direction as viewed from the axial direction of the rotary shaft 42, the fluid can be efficiently moved in the rotation direction of the auxiliary wings 52. In addition, the time required for stirring and mixing can be further reduced.

  Further, since the main wing 51 has the second inclined edge 517 inclined in a direction away from the rotary shaft 42 from the lower end edge 514 upward, the shaft rises from the bottom 22 side of the tank 2 toward the liquid surface side. The flow UF can be amplified, and the stirring on the bottom 22 side of the tank 2 can be promoted.

In addition, the present invention is not limited to the above-described embodiment, and includes modifications, improvements, and the like of shapes, materials, quantities, and other configurations within a range that can achieve the technical idea and purpose of the present invention. It is.
For example, the shape of the bottom portion 22 of the tank 2 is not limited to the one protruding downward, and the bottom portion 22A may be flat as shown in FIGS. In this case, the stirring blade 5 does not need to have the second inclined edge 517 provided on the main wing 51A as shown in FIG. 5, or has the second inclined edge 517 provided as shown in FIG. Is also good.

  When viewed from the axial direction of the rotating shaft 42, the supply unit 3 may supply the mixture to a circular region having the upper end edge 513 as a radius around the rotating shaft 42.

  The driving unit 4 may be provided below the tank 2. The driving unit 4 may be provided on the side of the tank 2. In this case, the driving unit 4 is connected to the upper end or the lower end of the rotating shaft 42 via a driving force transmission unit such as a gear, a pulley, or a belt. do it.

The stirring blade 5 may be configured such that the blade portion 512 is directly supported on the rotating shaft 42 without providing the mounting portion 511, or the auxiliary blade 52 is supported on the rotating shaft 42 by the arm 521.
The stirring blade 5 may be provided in the mounting part 511 so that the rotating shaft 42 can be inserted and removed, and may be configured to be detachable from the rotating shaft 42.

The number of wing portions 512 is not limited to two, but may be one, or three or more. When a plurality of wings 512 are provided, it is preferable that the wings 512 are arranged at equal angles.
The wing portion 512 may not be provided with a gap between the wing portion 512 and the rotating shaft 42.
The wing portion 512 may have a shape in which the first inclined edge 515 extends upward and the upper edge 513 forms an acute angle, or the shape in which the second inclined edge 517 extends upward and the lower edge 514 forms an acute angle. It may be.
The wing portion 512 may have a shape in which the first inclined edge 515 and the second inclined edge 517 are directly connected without providing the side edge 516.
The axial length of the region of the wing portion 512 on the second inclined edge 517 side may be longer than the axial length of the region on the first inclined edge 515 side. In this case, too, the balance between the strength of the shaft descending flow DF and the strength of the shaft ascending flow UF is not balanced, so that the boundary between the shaft descending flow DF and the shaft ascending flow UF is vertically moved at the height of the ejection point BP. A flow that passes through can be formed.
The side edge 516 may be inclined with respect to the rotation axis 42. In addition, the side edge 516 is not limited to a straight line, and may be configured with, for example, a curve or a waveform.
The first inclined edge 515 and the second inclined edge 517 may be constituted by a curved line, or may be constituted by a straight line and a curved line, as long as they are inclined in a direction away from the rotation shaft 42.

The auxiliary wing 52 is not limited to a flat plate. For example, as illustrated in FIG. 7, the auxiliary wing 52 is a plate-shaped one that is curved so that the rotation shaft 42 side is outward when viewed from the axial direction of the rotation shaft 42, and FIG. As shown, the shape may be a half-moon shape when viewed from the axial direction of the rotating shaft 42.
The auxiliary wing 52 may be supported on the wing portion 512 via the arm 521. Even in this case, it is preferable that the auxiliary wing 52 is disposed at the position of the auxiliary wing 52 so as to be inclined with respect to the tangent TL in the rotational direction.
The number of the auxiliary wings 52 may not be the same as the number of the wing portions 512, and may be one, or three or more. When a plurality of auxiliary wings 52 are provided, the auxiliary wings 52 may be provided at equal intervals or may be provided at different intervals.
The auxiliary wing 52 may be extended so as not to reach the height position of the side edge 516 of the main wing 51, or may be extended to the height position of the second inclined edge 517.

  The fluid is not limited to a medium- or high-viscosity fluid, and may be, for example, a low-viscosity fluid.

  The stirring device 1 and the stirring blade 5 can be used in the food industry, the pharmaceutical industry, and other industrial fields.

  DESCRIPTION OF SYMBOLS 1 ... Stirrer, 2 ... Tank, 3 ... Supply part, 4 ... Drive part, 5 ... Stirring blade, 42 ... Rotary shaft, 51 ... Main wing, 52 ... Auxiliary wing, 511 ... Mounting part, 512 ... Blade part, 513 ... Upper edge (edge of the main wing at one end), 514... Lower edge (edge of the main wing at the other end), 515... First inclined edge, 516.

Claims (5)

A flat main wing supported on a rotating shaft,
An auxiliary wing provided at a position separated from the main wing and the rotation axis,
The main wing includes a first inclined edge inclined in a direction away from the rotation shaft toward an end of the rotation shaft from an end edge of the main wing on one end side of the rotation shaft,
The agitating blade is characterized in that the auxiliary blade extends to the one end side of the rotary shaft with respect to a locus formed by the first inclined edge when the rotary shaft is rotated.   2. The stirring blade according to claim 1, wherein the auxiliary wing is arranged at a position of the auxiliary wing inclining with respect to a tangent in a rotation direction of the auxiliary wing when viewed from an axial direction of the rotation axis.   The main wing includes a second inclined edge inclined in a direction away from the rotation axis toward an end of the rotation shaft from the edge of the main wing on the other end side of the rotation shaft. The stirring blade according to claim 1 or 2, wherein: A tank provided to accommodate the fluid,
The stirring blade according to any one of claims 1 to 3, which is accommodated in the tank,
A driving unit that rotationally drives the stirring blade,
A supply unit for supplying the mixture to the tank.   The stirrer according to claim 4, wherein the supply unit supplies a solid material as the mixture.

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