JPH0344254Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Industrial Application) The present invention relates to a stirring screw for mixing and stirring powdery/granular solids and slurry.

(Prior Art) Conventionally, devices shown in FIGS. 1 to 3 are known as devices for mixing and stirring powder, granules, and slurry.

The device shown in FIG. 1 has a rotating shaft 3 equipped with spiral blades 2 vertically disposed in an upright cylindrical tank 1, and rotates the spiral blades 2 together with the rotating shaft 3. , the powder, granules, and slurry (hereinafter referred to as contents) in the tank 1 are stirred. However, this device has a structure in which the spiral blades are simply attached directly to the rotating shaft, and as it is necessary to leave a large distance between the spiral blades and the tank wall, the contents inside the tank cannot be The problem was that it would stick to the wall.

The device shown in Fig. 2 is equipped with spiral blades 4 on the inner wall of a cylindrical tank 1, and mixes and stirs the contents in the tank 1 by rotating the tank 1 while keeping it tilted. It is. However,
In this device, contents with a high specific gravity sink to the bottom of the tank, and it is difficult to mix and stir the sunken contents. In addition, especially in the case of sticky contents, they stick to each other and rotate together with the tank as a whole, which has the disadvantage that reliable mixing and stirring cannot be performed.

The device shown in FIG.
A rotating shaft 6 equipped with frame-shaped wings (so-called paddles) 5
are arranged vertically, and stirring is achieved by half-turning or rotating the rotating shaft 6. This device has the advantage of being able to reduce the distance between the paddle and the tank wall, which prevents the contents from sticking to the tank inner wall, and hardly causing so-called mud balls, where the contents harden into a spherical shape. mixture·
Useful for stirring. However, this device had the disadvantage that mixing and stirring in the vertical direction was not possible.

In this way, powders with poor fluidity and viscosity
It was difficult to uniformly mix and stir granules and slurry. Also, because the mixture is not uniform, mud balls may be formed during stirring, or
Alternatively, local compression may occur in the tank, making it difficult to mix and stir while maintaining the initial properties.
In particular, it was difficult to mix and stir uniformly in an upright tank.

(Purpose of the invention) Therefore, in view of the drawbacks of the above-mentioned conventional technology, the present invention
A spiral blade is fixed to a rotating shaft vertically disposed in the stirring tank by a supporting member, and the spiral blade continues to the lower part of the rotating shaft while spirally winding around the rotating shaft at a distance from the rotating shaft. , the blade surface of the spiral blade is formed so that it slopes downward toward the rotation axis, and the width of the blade surface becomes wider toward the bottom of the rotation axis, and the contents of the stirring tank are moved upward along the wall surface to form the spiral blade. By sliding the tank between the tank and the rotating shaft and also stirring in the circumferential direction, the purpose is to mix and stir the contents uniformly without sticking the contents to the tank wall or forming mud balls. .

(Structure of the invention) The stirring screw of the invention has a rotating shaft disposed vertically, and a spiral blade that is continuous below the rotating shaft while spirally winding around the rotating shaft at a distance from the rotating shaft. is fixed by a support member, and the blade surface of this spiral blade is formed to be inclined downward toward the rotation axis, and the width of the blade surface is formed to become wider toward the bottom of the rotation axis.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 4 to 6.

As shown in FIGS. 4 and 5, the stirring screw 10 of this embodiment includes a rotating shaft 11 and a spiral blade 12 integrally attached to the rotating shaft 11.

The rotating shaft 11 is disposed vertically within the stirring tank 13, its lower end is supported by a bearing 14 at the bottom of the tank, and its upper end is connected to a drive motor (not shown).
rotated by.

The spiral blade 12 is formed so as to continue below the rotating shaft while spirally surrounding the rotating shaft 11 with an appropriate interval between the spiral blades 12 and the rotating shaft 11. It is integrally fixed to the rotating shaft 11 by a support member 15 so as to be constant. The outer diameter of the spiral is set to be close to the wall surface of the stirring tank 13 within a range that does not hinder the rotation of the spiral blade 12. Further, the entire blade surface 12a of the spiral blade 12 is formed to be inclined downward toward the rotation axis 11.
The width is formed so that it gradually increases from the top to the bottom. Therefore, the structure is such that the distance between the spiral blade 12 and the rotating shaft 11 gradually increases from the bottom to the top.

In such a stirring screw 10, when the rotating shaft 11 is rotated in the direction A in the figure, the contents at the inner bottom of the stirring tank 13 are scooped up by the lower end of the spiral blade 12 and spilled onto the blade surface. 12a. The contents on the blade surface 12a move to the upper part of the stirring tank 13 along the tank wall as the spiral blade 12 rotates. This is due to the resultant force of the contents, the frictional force on the tank wall, and the force acting as the spiral blade rotates. Further, the contents that have moved to the upper part of the stirring tank 13 are removed from the upper surface 17 of the contents in the stirring tank 13.
If it exceeds this, the blade surface 12a of the spiral blade 12 is inclined inward, so it slides down from above the blade surface 12a and falls into the center of the stirring tank 13. By repeating this, the contents in the stirring tank 13 are stirred in the vertical direction of the stirring tank 13, as shown by the arrows in FIG. In addition, since the contents in the tank are also stirred in the circumferential direction within the tank by the rotation of the spiral blades 12, the contents in the tank are stirred in the combined direction of the vertical direction and the circumferential direction of the stirring tank 13. Therefore, by simply rotating the spiral blade, it is possible to stir the contents in the vertical and circumferential directions, and also to stir the contents without sticking them to the inner wall of the tank, making it possible to mix the contents uniformly.

In addition, as shown in FIG. 6, a scraper (stirring rod) 16 may be installed horizontally in a position below the spiral blade of the rotating shaft, thereby more reliably cleaning the contents at the bottom of the tank. Can be carried on spiral wings. Moreover, if the width of the blade surface of the spiral blade is formed to be gradually narrower from the lower part to the upper part as in the above embodiment, the natural fall of the contents can be further ensured. Furthermore, the angle of inclination of the blade surface of the spiral blade is preferably about 10° to 45° downward, but may be set as appropriate depending on the adhesiveness of the contents.

Furthermore, in the above embodiment, several parts of the spiral blade were fixed to the support member, but by increasing the strength of the spiral blade, only two places on the top and bottom of the spiral blade were fixed to the rotating shaft, thereby further stirring the blade. The effect can be increased.

(Effects) As explained above, according to the present invention, the contents in the stirring tank are moved to the top of the tank along the tank wall by the spiral blades, thereby preventing the contents from sticking to the tank wall. can. In addition, the rotation of the spiral blades allows the contents in the stirring tank to fall easily, and since the contents are stirred in the circumferential direction as well as in the vertical direction, the contents can be mixed uniformly. Can prevent changes in properties. Furthermore, since the rotating shaft has spiral blades extending from the bottom to the top of the stirring tank,
Sufficient stirring is possible even when the contents in the tank are small.

[Brief explanation of the drawing]

Figures 1 to 3 are schematic diagrams respectively showing conventional stirring devices, Figures 4 and 5 relate to an embodiment of the present invention, Figure 4 is a perspective view of the stirring screw, and Figure 5 is a front view thereof. FIG. 6 is a front view showing another example of the lower part of the stirring screw. 10... Stirring screw, 11... Rotating shaft, 1
2, 12a... spiral wing and its wing surface, 15...
Support member.

Claims (1)

[Scope of utility model registration request] A spiral blade is fixed to a vertically disposed rotating shaft by a support member, and the spiral blade continues below the rotating shaft while spirally winding around the rotating shaft with a space between the rotating shaft and the rotating shaft. A stirring screw characterized in that the blade surface of the blade is inclined downward toward the rotation axis, and the width of the blade surface becomes wider toward the bottom of the rotation axis.