WO2013098967A1 - Stirring device - Google Patents

Abstract

[Problem] To provide a stirring device wherein it is possible to expand or reduce the diameter of a stirring wind member without using a complex open/close mechanism, the stirring wing member is less prone to operation failure, and repairs are easily performed when there are damages. [Solution] A stirring device at least provided with: a drive part main body having a driving means; a drive shaft which penetrates the drive part main body in the top and bottom direction, extends toward the bottom of the drive part main body, and is rotated and driven by means of the driving means; at least two stirring wing members which are pivotally fitted to the bottom edge portion of the drive shaft, and which are installed in a protruding manner on the side of the driving shaft such that the diameters of the stirring wing members can expand or reduce; a slider member which is positioned on the bottom portion of the drive part main body and is configured such that the drive shaft is inserted in a freely fitting manner so as to be able to move in the top and bottom direction; and rod members of which one end is pivotally fitted to the slider member in a rotatable manner, and of which the other end is pivotally fitted in a rotatable manner to the base-end side part of the stirring wing members positioned on the side that is pivotally fitted to the drive shaft. When the drive shaft is moved upward relative to the drive part main body and the rod members pivotally fitted to the base-end side part of the stirring wing members are moved in the direction that bears away from the drive shaft, the outside end part of the stirring wing members positioned toward the side where the diameter thereof is expanded is brought close to the drive shaft while the position where the stirring wing members are pivotally fitted to the drive shaft functions as a pivot point, thereby reducing the diameter of the stirring wing members. When the drive shaft is moved downward relative to the drive part main body and the rod members pivotally fitted to the base-end side part of the stirring wing members are moved in the direction that is closer to the drive shaft, the outside end part of the stirring wing members positioned toward the side where the diameter thereof is expanded is brought apart from the drive shaft while the position where the stirring wing members are pivotally fitted to the drive shaft functions as a pivot point, thereby expanding the diameter of the stirring wing members. Moreover, the stirring wing members pivotally fitted on the drive shaft rotates along with the drive shaft by rotating the drive shaft by means of the driving means.

Description

Stirrer

The present invention relates to an agitation device for uniformly agitating contents contained in a tank such as a paint raw material tank or a brewing tank.

Conventionally, a container tank, for example, a container tank containing paint raw materials, is transported to a place of use such as a shipyard or a steelworks using a container truck. In this case, the contents stored in the container tank are often separated due to the difference in specific gravity due to the influence of vibration during transportation, and in particular, when the contents are paint raw materials, Since solvents such as thinner are separated and pigments with high viscosity and high density are precipitated at the bottom in the container tank, it is necessary to uniformly stir during use.

For this reason, conventionally, for example, a stirring blade member connected to a driving shaft for stirring is inserted into the tank through an opening formed in the upper part of the tank, and is connected to the driving shaft by a motor connected to the driving shaft from the outside of the tank. The stirring blade member was rotated, thereby stirring the contents in the tank.

However, in this method, since only a stirring blade member having an outer diameter smaller than the opening of the tank can be inserted into the tank, only a relatively small stirring blade member can be used with respect to the size of the tank. The stirring efficiency was poor.

For this reason, the stirring efficiency was improved by rotating the stirring blade member at a high speed. In this case, however, it is necessary to use a large motor that rotates the stirring blade member at a high speed. However, there is a problem in terms of handleability and equipment cost.

In order to solve these conventional problems, when inserting the stirring blade member into the inside from the opening of the tank, the inventors have an outer diameter smaller than the inner diameter of the opening, A stirring device having a structure in which the blade member passes through the opening of the tank and the stirring blade member expands larger than the size of the opening has already been developed (Patent Document 1).

Such a stirrer 100 has a base end member to which the stirring blade member 104 is attached as shown in FIG. 9 in order to expand and contract the diameter of the stirring blade member 104 connected to the drive shaft 102 as shown in FIG. A rack and pinion structure is used in 106 and the rack member 108 interlocked with the base end member 106, and the actual operation of the stirring blade member 104 is controlled by using the spring member 110.

Therefore, it is possible to use the stirring blade member 104 having the outermost diameter larger than that of the opening 122 of the tank 120 so that the stirring efficiency can be increased.

Japanese Patent No. 3210877

However, the structure of the rack and pinion in such a conventional stirring apparatus 100 is very complicated, is liable to cause a failure, and requires time and labor to repair in the event of a failure.

Further, as the contents are stirred, the contents are clogged and fixed to the rack-and-pinion meshing portion 124 of the rack and pinion, thereby causing the operation failure when the stirring blade member 104 is expanded or contracted. The actual situation is that further improvements are required.

The present invention has been made in view of such a current situation, and can perform the operation of the expansion / contraction diameter of the stirring blade member without using a complicated opening / closing mechanism, and the malfunction of the stirring blade member is unlikely to occur. It is an object of the present invention to provide a stirring device that can be easily repaired.

In addition, when stirring the contents in the tank, it can be inserted into the inside from the opening of the tank, and in the tank, the stirring blade member can be expanded in diameter larger than the size of the opening of the tank, It aims at providing the stirring apparatus which can perform stirring of the content efficiently by this.

The present invention was invented to solve the problems in the prior art as described above,
The stirring device of the present invention comprises:
A drive unit body provided with drive means;
A drive shaft that penetrates the drive unit body in the vertical direction and extends downward from the drive unit body, and is rotationally driven by the drive means;
At least two stirring blade members pivotally attached to the lower end portion of the drive shaft and projecting so as to be able to expand and contract on the side of the drive shaft;
A slider member that is positioned at the bottom of the drive unit main body, is inserted through the drive shaft in a loosely-fitted state, and the drive shaft is configured to be movable up and down;
One rod member pivotally mounted on the slider member and the other pivotally mounted on the proximal end located on the side pivoted on the drive shaft of the stirring blade member When,
Comprising at least
By moving the drive shaft upward with respect to the drive unit main body and moving the rod member pivotally attached to the base end side end of the stirring blade member in a direction away from the drive shaft The stirrer blade member is brought into a reduced-diameter state by bringing the outer end located on the side of the stirrer blade member to be expanded / reduced diameter closer to the drive shaft, with the pivoting position with the drive shaft as a fulcrum,
By moving the drive shaft downward with respect to the drive unit main body and moving the rod member pivotally attached to the base end side end of the stirring blade member in a direction approaching the drive shaft The stirrer blade member is in a diameter-expanded state with the outer end located on the side of the stirrer blade being expanded or contracted away from the drive shaft, with the pivoting position with the drive shaft as a fulcrum,
The stirring blade member pivotally attached to the drive shaft rotates with the drive shaft by rotating the drive shaft with the drive means.

With this configuration, since the operation of the expansion / contraction diameter of the stirring blade member can be generated by a relatively simple mechanism, it is difficult for the stirring blade member to malfunction, and even if a failure occurs, the repair is easy. It can be carried out.

Therefore, it is possible to reduce the cost required for the apparatus, and it is possible to quickly recover even in the event of a failure, thereby reducing the cost required for maintenance.

Furthermore, when stirring the contents in the tank, it can be inserted into the inside from the opening of the tank, and the stirring blade member can be expanded in diameter larger than the size of the opening of the tank in the tank. In particular, the contents can be stirred.

In addition, if the content is high viscosity and high density, such as a paint raw material, a large horsepower or torque is required for rotation of the stirring blade member, but in the stirring measure of the present invention, the expansion / contraction diameter of the stirring blade member Can be generated with a relatively simple mechanism, and the stirring blade member can be expanded and used with a larger diameter. The contents can be stirred.

Moreover, the stirring device of the present invention comprises:
The drive shaft is provided with a keyway in the extending direction of the drive shaft,
The slider member is provided with an engagement key member that engages with the keyway of the drive shaft,
The drive shaft is configured to be movable up and down within the key groove formation range of the drive shaft.

If configured in this manner, since the key groove and the engagement key member are engaged, the slider member can be rotated together with the drive shaft when the drive shaft is rotated.

Moreover, the stirring device of the present invention comprises:
A suspension member is provided at the upper end of the drive shaft.

With this configuration, it is possible to easily lift or suspend the stirring device using, for example, a hoist crane or a forklift provided with a lifting jig.

Moreover, the stirring device of the present invention comprises:
The stirring device is for stirring the contents in the tank,
The drive unit main body of the stirring device is configured to be attached to the periphery of the opening of the tank.

If the stirring device is attached to the opening of the tank in this way, the contents in the tank can be reliably and efficiently stirred.

Also, since the agitation device is easy to handle, even when it is moved to another tank, it only needs to be lifted and moved, and the workability is good.

Moreover, the stirring device of the present invention comprises:
When the stirring device is attached to the opening of the tank, the rake angle of the stirring blade member and the pivot position of the stirring blade member with the drive shaft so that the diameter of the stirring blade member is always increased by its own weight. Is stipulated, and
The stirring blade member is configured to expand in diameter by a centrifugal force generated when the driving shaft is rotated by the driving means.

If the stirring blade member is defined in this way, the stirring blade member is always in its expanded state due to its own weight.For example, the pivot point between the stirring blade member and the drive shaft is fixed by the contents in the tank. Even if the drive shaft rotates, a load is applied to the stirring blade member in the diameter-expanding direction together with the centrifugal force during rotation of the drive shaft, and the fixation can be easily released.

Moreover, the stirring device of the present invention comprises:
The size of the outermost diameter when the stirring blade member is reduced in diameter is smaller than the size of the opening of the tank.

If configured in this way, the stirring device can be easily inserted into the tank or taken out of the tank simply by lifting or hanging the stirring device. Therefore, operability is good and work efficiency can be improved.

According to the present invention, since the operation of the expansion / contraction diameter of the stirring blade member can be generated by a relatively simple mechanism, the operation failure of the stirring blade member hardly occurs, and repair is easily performed even if a failure occurs. It is possible to provide a stirring device that can perform the above-described operation.

In addition, when stirring the contents in the tank, it can be inserted into the tank from the opening of the tank, and in the tank, the stirring blade member has a diameter larger than the size of the opening of the tank. It is possible to provide a stirring device capable of stirring the contents.

FIG. 1 is a schematic view showing a state in which the diameter of a stirring blade member is increased in the stirring device of the present invention. FIG. 2 is a schematic view showing a state where the diameter of the stirring blade member is reduced in the stirring device of the present invention. FIG. 3 is a cross-sectional view for explaining the prescribed structure of the vertical movement of the drive shaft by the stopper member provided on the drive shaft and the spacer member provided in a loosely fitted state on the upper end of the drive shaft in the stirring device of the present invention. FIG. 3A is an enlarged cross-sectional view of a main part when the drive shaft is moved upward with respect to the drive unit main body, and FIG. 3B is a lower side of the drive shaft with respect to the drive unit main body. It is a principal part expanded sectional view at the time of making it move to. FIG. 4 is a schematic view showing a state where the stirring device of the present invention is suspended and positioned on the opening of the tank. FIG. 5 is a schematic view showing a state in which the stirring device of the present invention is suspended and inserted into the tank through the opening of the tank. FIG. 6 is a schematic view showing a state in which the stirring device of the present invention is suspended and the drive unit main body is positioned at the opening of the tank. FIG. 7 is a schematic view showing a state where the stirring device of the present invention is installed in the opening of the tank and the diameter of the stirring blade member is increased. FIG. 8 is a schematic view showing a state in which a conventional stirring device is mounted on a tank. FIG. 9 is a schematic diagram for explaining a rack and pinion structure of a conventional stirring device.

The stirring device of the present invention is for uniformly stirring contents contained in a tank such as a paint raw material tank or a brewing tank.

Hereinafter, embodiments of the stirring device of the present invention will be described with reference to the drawings.

As shown in FIG. 1, the stirring device 10 according to the present embodiment includes a drive unit main body 14 provided with a drive unit 12, and passes through the drive unit main body 14 in the vertical direction and below the drive unit main body 14. A drive shaft 16 is provided that extends toward the drive and is rotationally driven by the drive means 12.

Here, any drive means 12 for rotating the drive shaft 16 may be used. For example, an electric motor or an air motor can be used. Among these, the air motor adjusts the air pressure to be supplied by an air control unit (not shown), and the number of revolutions is adjusted, and the structure is simple. In addition, it is preferable for reducing the manufacturing cost.

The drive unit main body 14 includes a flange portion 44 that is held at the periphery of the opening 52 of the tank 50 when attached to the opening 52 of the tank 50 described later.

Further, at least two agitating blade members 24 are provided on the lower end portion 18 of the drive shaft 16 so as to project from the side of the drive shaft 16 so as to be able to expand and contract. In the present embodiment shown in FIG. 1, the number of the stirring blade members 24 is two. However, the present invention is not limited to this, and the content to be stirred such as three, four or more at regular intervals. The amount may be increased as appropriate according to the amount and viscosity. In FIG. 1, reference numeral 22 denotes a pivoting portion with the drive shaft 16.

Further, the shape of the stirring blade member 24 is not particularly limited, but when the stirring device 10 described later is attached to the opening 52 of the tank 50, the stirring blade member 24 always expands due to its own weight. In addition, the rake angle of the stirring blade member 24 and the position of the pivoting portion 22 of the stirring blade member 24 with the drive shaft 16 may be defined.

On the other hand, the bottom 46 of the drive unit body 14 is provided with a slider member 30 in which the drive shaft 16 is inserted in a loosely fitted state and the drive shaft 16 is movable up and down.

The slider member 30 and the base end side end portion 26 located on the side pivotally attached to the drive shaft 16 of the stirring blade member 24 are connected by a rod member 36.

One of the rod members 36 is pivotally attached to the slider member 30 and the other is pivotally attached to the proximal end 26 of the stirring blade member 24. In FIG. 1, reference numerals 32 and 34 are pivotal portions with the rod member 36.

The stirring device 10 of the present embodiment configured as described above is pivotally attached to the proximal end 26 of the stirring blade member 24 when the drive shaft 16 is first moved downward with respect to the drive unit main body 14. The rod member 36 is moved in a direction approaching the drive shaft 16.

As a result, the stirring blade member 24 pivotally attached to the rod member 36 on the proximal end 26 is a side where the diameter of the stirring blade member 24 is increased or reduced with the pivot position (the pivot portion 22) with the drive shaft 16 as a fulcrum. The outer side end portion 28 located at a distance from the drive shaft 16 is expanded in diameter.

On the other hand, when the drive shaft 16 is moved upward with respect to the drive unit main body 14, as shown in FIG. 2, the rod member 36 pivotally attached to the proximal end 26 of the stirring blade member 24 is now replaced. Is moved away from the drive shaft 16.

As a result, the stirring blade member 24 pivotally attached to the rod member 36 on the proximal end 26 is a side where the diameter of the stirring blade member 24 is increased or reduced with the pivot position (the pivot portion 22) with the drive shaft 16 as a fulcrum. The outer side end portion 28 located in the position moves in a direction approaching the drive shaft 16 and enters a reduced diameter state.

The agitating device 10 of this embodiment configured so that the agitating blade member 24 expands and contracts by such a mechanism, the agitating blade member pivotally attached to the driving shaft 16 by rotating the driving shaft 16 by the driving means 12. 24 can be rotated together with the drive shaft 16.

The range of diameter expansion and contraction of the stirring blade member 24 changes according to the amount of vertical movement of the drive shaft 16. Therefore, if the vertical movement range of the drive shaft 16 is restricted, the expansion of the stirring blade member 24 is increased. The range of diameter and reduced diameter can be specified.

The means for restricting the vertical movement range of the drive shaft 16 is not particularly limited. For example, a key groove 38 is provided in the extending direction of the drive shaft 16, and the key groove of the drive shaft 16 is provided in the slider member 30. If the engagement key member 40 that engages with the drive shaft 16 is provided, the drive shaft 16 can be moved up and down within the formation range of the key groove 38 of the drive shaft 16.

In this embodiment, as shown in FIGS. 3A and 3B, the key groove 38 of the drive shaft 16 is made longer in the vertical direction than the range in which the drive shaft 16 is actually moved up and down. By setting, the movable range in the vertical direction of the drive shaft 16 can be arbitrarily set.

Here, FIG. 3A shows a state in which the drive shaft 16 is moved up to the maximum with respect to the drive unit main body 14, and FIG. 3B shows the drive shaft 16 moved to the drive unit main body 14. It shows the state moved downward to the maximum.

As a specific structure for making it possible to arbitrarily set the movable range in the vertical direction of the drive shaft 16, for example, at a predetermined position below the slider member 30, the fastening member 60 is inserted into the key groove 38 of the drive shaft 16. Are engaged with each other to fix the stopper member 48 to the drive shaft 16, thereby defining an upward movement range (lifting length) of the drive shaft 16, and the drive shaft 16 is attached to the upper end portion 20 of the drive shaft 16. There is a structure in which the spacer member 58 is disposed so as to be loosely fitted, thereby defining a range of movement of the drive shaft 16 downward.

Further, since such a structure is an engagement structure between the key groove 38 and the engagement key member 40, a structure suitable for rotating the slider member 30 together with the drive shaft 16 when the drive shaft 16 rotates. It is.

In the figure, reference numeral 54 denotes a hollow shaft. The hollow shaft 54 is used to transmit the force by the driving means 12 to the driving shaft 16 when the driving shaft 16 is rotated. In the present embodiment, the hollow shaft 54 is rotated by the driving means 12. The hollow shaft 54 and the drive shaft 16 engage with each other in the relationship between the key groove 38 and the key, and rotate together. Reference numeral 62 denotes an engagement key member provided on the hollow shaft 54.

Of course, the drive shaft 16 may be directly rotated by the drive means 12 without using the hollow shaft 54.

Further, in the agitator 10 described above, a suspension member 42 is attached to the upper end portion 20 of the drive shaft 16, and actually the suspension member 42 is attached to a hoist crane (not shown) or a forklift. It is designed to be used by suspending and moving it with something (not shown).

When the stirring device 10 is lifted through the suspension member 42 attached to the upper end portion 20 of the drive shaft 16 like the stirring device 10 shown in FIG. 2, the drive shaft 16 is lifted upward, Thus, the stirring blade member 24 pivotally attached to the drive shaft 16 is brought into a reduced diameter state.

On the other hand, when the flange portion 44 of the drive unit main body 14 of the stirring device 10 is supported on the periphery of the opening 52 of the tank 50 described later, the stirring blade member 24 is pivotally attached by the weight of the stirring blade member 24. The drive shaft 16 is lowered downward, so that the stirring blade member 24 is in an expanded state.

Next, the case where such a stirring device 10 is used when stirring the contents (not shown) in the tank 50 will be described in detail with reference to the drawings.

First, as shown in FIG. 4, the lid (not shown) that closes the opening 52 of the tank 50 is removed, and the stirring device 10 is connected via the suspension member 42 attached to the upper end 20 of the drive shaft 16. Is placed on the opening 52 of the tank 50. At this time, the outermost diameter D2 of the stirring blade member 24 when the diameter is reduced is smaller than the size D1 of the opening 52 of the tank 50.

Then, as shown in FIG. 5, the stirring device 10 is inserted into the tank 50 through the opening 52 of the tank 50.

When the stirrer 10 is further inserted into the tank 50, the flange portion 44 of the drive unit body 14 of the stirrer 10 comes into contact with the peripheral edge of the opening 52 of the tank 50 as shown in FIG. At this position, the flange portion 44 of the drive unit main body 14 is detachably fixed to the periphery of the opening 52 of the tank 50 via the fastening member 56.

At this time, the fastening position of the lid and the fastening position of the flange portion 44 of the agitating device 10 are matched so that the fastening member that has stopped the lid (not shown) of the opening 52 of the tank can be used. It is preferable to keep it.

Thus, the part other than the drive unit main body 14 of the stirring device 10 is suspended by the suspension member 42 attached to the upper end 20 of the drive shaft 16.

Then, as shown in FIG. 7, when the drive shaft 16 is further lowered, the stirring blade member 24 pivotally attached to the lower end portion 18 of the drive shaft 16 increases in diameter. In addition, since the stirring blade member 24 moves in the diameter-expanding direction by its own weight, the stirring blade member 24 has a content in a pivotally attached portion of the drive shaft 16 and the stirring blade member 24 when used before, for example. Even if an object is fixed, the fixation is easily released, and problems such as malfunctions are less likely to occur.

Further, as described above, the diameter range of the stirring blade member 24 is set by the stopper member 48 and the spacer member 58 or the key groove 38 of the drive shaft 16 engaged with the engagement key member 40 of the slider member 30. The position is determined in advance by the formation position and range, and further by the length of the rod member 36. As a result, the diameter of the stirring blade member 24 is expanded to a predetermined range, and preparation for stirring the contents in the tank 50 is completed. To do.

Then, by rotating the drive shaft 16 via the drive means 12 in this expanded state, the stirring blade member 24 pivotally attached together with the drive shaft 16 is rotated, thereby stirring the contents in the tank 50. Will be made.

After stirring, the stirring device 10 is lifted again, and the stirring blade member 24 is taken out of the tank 50 from the opening 52 of the tank 50 in a reduced diameter state, so that the work accompanying stirring can be easily completed.

As described above, the stirring device 10 of the present invention can cause the operation of expanding and contracting the diameter of the stirring blade member 24 by a relatively simple mechanism, and thus the malfunction of the stirring blade member 24 hardly occurs, and cleaning is also performed. It is easy. Even if a failure occurs, the number of constituent members constituting the stirring device 10 is small, so that repair can be easily performed and the maintainability is good.

Therefore, if the stirring device 10 of the present invention is used, the contents in the tank 50 can be reliably stirred, and only the stirring device 10 is suspended via the suspension member 42 of the drive shaft 16 when moving. In addition, since the diameter of the stirring blade member 24 is reduced by the lifting operation of the drive shaft 16, the handleability is also good.

As mentioned above, although one Embodiment of the stirring apparatus of this invention was described, this invention is not limited to said embodiment and use environment, A various change is possible in the range which does not deviate from the objective of this invention. It is.

DESCRIPTION OF SYMBOLS 10 ... Stirring device 12 ... Drive means 14 ... Drive part main body 16 ... Drive shaft 18 ... Lower end part 20 ... Upper end part 22 ... Pivoting part 24 ... Stirring blade Member 26 ... Base end side end 28 ... Outer side end 30 ... Slider member 32 ... Pivoting portion 34 ... Pivoting portion 36 ... Rod member 38 ... Key Groove 40 ... engagement key member 42 ... suspending member 44 ... flange 46 ... bottom 48 ... stopper member 50 ... tank 52 ... opening 54 ... hollow shaft 56 ... Fastening member 58 ... Spacer member 60 ... Fastening member 62 ... Engagement key member D1 ··· The size of the opening D2 · · · The size of the outermost diameter when the diameter of the stirring blade member is reduced DESCRIPTION OF SYMBOLS 100 ... Stirring apparatus 102 ... Drive shaft 104 ... Stirring blade member 106 ... Base member 108 ... rack member 110 ... spring member 120 ... tank 122 ... opening 124 ... rack portion meshing of pinion

Claims (6)

A drive unit body provided with drive means;
A drive shaft that penetrates the drive unit body in the vertical direction and extends downward from the drive unit body, and is rotationally driven by the drive means;
At least two stirring blade members pivotally attached to the lower end portion of the drive shaft and projecting so as to be able to expand and contract on the side of the drive shaft;
A slider member that is positioned at the bottom of the drive unit main body, is inserted through the drive shaft in a loosely-fitted state, and the drive shaft is configured to be movable up and down;
One rod member pivotally mounted on the slider member and the other pivotally mounted on the proximal end located on the side pivoted on the drive shaft of the stirring blade member When,
Comprising at least
By moving the drive shaft upward with respect to the drive unit main body and moving the rod member pivotally attached to the base end side end of the stirring blade member in a direction away from the drive shaft The stirrer blade member is brought into a reduced-diameter state by bringing the outer end located on the side of the stirrer blade member to be enlarged / reduced diameter closer to the drive shaft, with the pivoting position with the drive shaft as a fulcrum,
By moving the drive shaft downward with respect to the drive unit main body and moving the rod member pivotally attached to the base end side end of the stirring blade member in a direction approaching the drive shaft The stirring blade member is in a diameter-enlarged state by separating the outer side end located on the side of the stirring blade member to be expanded and contracted from the drive shaft, with the pivoting position with the drive shaft as a fulcrum,
An agitation device characterized in that the agitation blade member pivotally attached to the drive shaft rotates with the drive shaft by rotating the drive shaft by the drive means. The drive shaft is provided with a keyway in the extending direction of the drive shaft,
The slider member is provided with an engagement key member that engages with the keyway of the drive shaft,
The stirring device according to claim 1, wherein the drive shaft is configured to be movable up and down within a range in which the keyway of the drive shaft is formed. The stirring device according to claim 1 or 2, wherein a suspension member is provided at an upper end portion of the drive shaft. The stirring device is for stirring the contents in the tank,
The stirring device according to any one of claims 1 to 3, wherein the drive unit main body of the stirring device is configured to be attached to a peripheral edge of the opening of the tank. When the stirring device is attached to the opening of the tank, the rake angle of the stirring blade member and the pivot position of the stirring blade member with the drive shaft so that the diameter of the stirring blade member is always increased by its own weight. Is stipulated, and
The stirring device according to claim 4, wherein the stirring blade member is configured to expand in diameter by a centrifugal force generated when the driving shaft is rotated by the driving means. The stirrer according to claim 4 or 5, wherein the outermost diameter of the stirring blade member is smaller than the size of the opening of the tank.

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