CN211462777U - Stirring mechanism and stirring device - Google Patents

Abstract

The utility model provides a stirring mechanism and a stirring device, which relate to the technical field of material stirring and comprise a central shaft lever, a first foot lever and a second foot lever; because first foot pole and second foot pole all with center pin pole parallel arrangement, the top of first foot pole and the top of second foot pole all are connected with the center pin pole through the connecting rod, make first foot pole and the whole lower part that is located the center pin pole of second foot pole, during the use, only need stretch into below the liquid level with the paddle subassembly on first foot pole and the second foot pole, the center pin pole can drive the paddle subassembly and stir liquid with rotating, and the center pin pole need not contact with liquid, liquid can not climb along the center pin pole, do benefit to the mixed effect that improves viscous liquid.

Description

Stirring mechanism and stirring device

Technical Field

The utility model belongs to the technical field of the material stirring technique and specifically relates to an rabbling mechanism and agitating unit are related to.

Background

In the production process of pharmaceutical chemicals, food and the like, two phases of viscous solid and liquid or the mixture of two viscous liquids is often encountered, and in the mixing process, the liquid in the tank body is mostly stirred by a stirring mechanism such as a stirring paddle, so that the mixing effect and the mixing efficiency are improved.

The stirring paddle at present usually adopts the (mixing) shaft that has a plurality of paddles, and a plurality of paddles wherein set up along the length direction interval of (mixing) shaft, and the (mixing) shaft drives a plurality of stirring paddle leaf and stretches to stir viscous liquid below the liquid level.

Because the (mixing) shaft directly stretches into below the liquid level, at the stirring in-process, the position that is close to the (mixing) shaft more, the shearing that liquid received is less, keeps away from the position of center pin more, and the shearing that liquid received is big more for liquid is stretched and twines on the (mixing) shaft along the axial of (mixing) shaft, produces the pole-climbing effect promptly, and the existence of pole-climbing effect has seriously influenced the mixed effect between two kinds of viscidity liquid.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art that is known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide an rabbling mechanism and agitating unit to having alleviated current rabbling mechanism and having made easily by stirring liquid produce the pole-climbing effect, be difficult to make two kinds of viscidity liquid misce bene's technical problem.

In order to solve the technical problem, the utility model provides a technical scheme lies in:

the utility model provides a stirring mechanism, which comprises a central shaft lever, a first foot lever and a second foot lever;

the first foot rod and the second foot rod are both arranged in parallel with the central shaft rod, and the top end of the first foot rod and the top end of the second foot rod are both connected with the central shaft rod through connecting rods;

the first foot bar and the second foot bar are provided with paddle components, and the paddle components are used for extending into the liquid to be stirred to stir the liquid.

Further, the blade assembly comprises an inner stirring blade and an outer stirring blade;

the stirring inner blade is configured to be symmetrical to the stirring outer blade about the central axis of the first foot rod after rotating around the central axis of the stirring inner blade in the length direction by a first angle, and the first angle is set to be 0-180 degrees.

Further, the stirring inner blade comprises a first stirring flat plate, and the stirring outer blade comprises a second stirring flat plate;

the first foot rod and the central shaft rod are located in a first plane, and a first included angle is formed between the plane where the first stirring flat plate is located and the first plane.

Further, the first included angle is set to be 0-90 degrees.

Furthermore, the stirring inner blade and the stirring outer blade are both set to be torsional curved surfaces.

Further, the first stirring flat plate and the second stirring flat plate are both rectangular flat plates, and the ratio of the length of the first stirring flat plate to the length of the second stirring flat plate is set to be 10: 1-1: 1.

Furthermore, the stirring mechanism also comprises at least one third foot rod which is arranged in parallel with the central shaft rod;

the top end of the third foot rod is connected with the central shaft rod through the connecting rod, and the third foot rod is provided with the paddle component;

the first foot rod, the second foot rod and the third foot rod are uniformly arranged around the central axis of the central shaft rod at intervals.

Further, the first foot rod, the second foot rod and the third foot rod are arranged in equal length, and the ratio of the minimum linear distance between the stirring inner blade on the first foot rod and the corresponding stirring inner blade on the second foot rod or the third foot rod to the length of the first foot rod is set to be 1: 50-1: 2.

Furthermore, the number of the paddle assemblies on the first foot bar, the second foot bar and the third foot bar is equal, and the paddle assemblies are arranged in a plurality; the paddle components are uniformly arranged layer by layer at intervals along the axial direction of the corresponding foot rod, and the ratio of the minimum linear distance between every two adjacent layers of the paddle components to the length of the first foot rod is 1:1-1: 50;

the included angle between the planes of the two stirring inner blades in the two adjacent layers of blade assemblies is set to be 90-180 degrees.

The utility model provides a stirring device, which comprises a driving part, a liquid storage part and a stirring mechanism;

the driving part is arranged in the liquid storage part, is in transmission connection with the central shaft rod, and drives the blade assembly to rotate around the central shaft rod through the central shaft rod.

Technical scheme more than combining, the utility model discloses the beneficial effect who reaches lies in:

the utility model provides a stirring mechanism, which comprises a central shaft lever, a first foot lever and a second foot lever; the first foot rod and the second foot rod are both arranged in parallel with the central shaft rod, and the top end of the first foot rod and the top end of the second foot rod are both connected with the central shaft rod through connecting rods; all be provided with paddle subassembly on the first foot pole and on the second foot pole, paddle subassembly is used for stretching into and stirs liquid in waiting to stir liquid.

Because first foot pole and second foot pole all with center pin pole parallel arrangement, the top of first foot pole and the top of second foot pole all are connected with the center pin pole through the connecting rod, make first foot pole and the whole lower part that is located the center pin pole of second foot pole, during the use, only need stretch into below the liquid level with the paddle subassembly on first foot pole and the second foot pole, the center pin pole can drive the paddle subassembly and stir liquid with rotating, and the center pin pole need not contact with liquid, liquid can not climb along the center pin pole, do benefit to the mixed effect that improves viscous liquid.

Drawings

For a clear explanation of the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of an agitating mechanism provided in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an agitating mechanism provided in an embodiment of the present invention in another embodiment;

fig. 3 is a schematic structural view of a stirring mechanism including a third leg according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of the stirring mechanism provided by the embodiment of the present invention when the paddle assemblies are arranged in multiple layers.

Icon: 100-central shaft; 200-a first leg bar; 300-a second foot bar; 400-a connecting rod; 500-a blade assembly; 510-stirring the inner leaves; 520-stirring the outer leaves; 530-connecting sleeve; 600-third leg bar.

Detailed Description

The technical solution of the present invention will be described in detail and fully with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that, as the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. appear, the indicated orientation or positional relationship thereof is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, but does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" as appearing herein are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may for example be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, the present embodiment provides a stirring mechanism, which includes a central shaft 100, a first leg 200 and a second leg 300; the first leg bar 200 and the second leg bar 300 are both arranged in parallel with the central shaft bar 100, and the top end of the first leg bar 200 and the top end of the second leg bar 300 are both connected with the central shaft bar 100 through the connecting rod 400; all be provided with paddle component 500 on first foot pole 200 and the second foot pole 300, paddle component 500 is used for stretching into and waits to stir liquid in to stir liquid.

Specifically, the central shaft rod 100 is a metal cylindrical rod, the connecting rod 400 is a metal connecting rod, and the connecting rod 400 is welded at the bottom end of the central shaft rod 100; the stirring mechanism includes, but is not limited to, a first leg rod 200 and a second leg rod 300, wherein the top end of the first leg rod 200 and the top end of the second leg rod 300 are connected with the bottom end of the central shaft rod 100 through a connecting rod 400, and the connection is preferably welded;

the connecting rods 400 can be arranged as a whole or two, when the connecting rods 400 are arranged as two, the connecting rods include a first connecting rod and a second connecting rod, the central shaft 100 is connected with the first foot rod 200 through the first connecting rod, and the central shaft 100 is connected with the second foot rod 300 through the second connecting rod; when the connecting rod 400 is a whole, the central shaft 100 is perpendicular to the connecting rod 400, and the connecting point of the central shaft 100 and the connecting rod 400 is located at the middle position of the length of the connecting rod 400, the top end of the first leg rod 200 and the top end of the second leg rod 300 are respectively welded at two ends of the connecting rod 400 or the connecting rod 400, the first leg rod 200 and the second leg rod 300 are integrally formed.

The blade assembly 500 can be provided as stirring blades with various shapes, and the blade assembly 500 can be connected with the first foot bar 200 or the second foot bar 300 in a detachable connection mode such as welding, bolts, joggles and the like; the central shaft 100 drives the blade assembly 500 to rotate in the liquid to be stirred through the first leg 200 and the second leg 300.

The stirring mechanism provided by the embodiment, because the first leg rod 200 and the second leg rod 300 are all parallel to the central shaft rod 100, and the top end of the first leg rod 200 and the top end of the second leg rod 300 are all connected with the central shaft rod 100 through the connecting rod 400, so that the first leg rod 200 and the second leg rod 300 are integrally located at the lower part of the central shaft rod 100, during use, only the paddle assemblies 500 on the first leg rod 200 and the second leg rod 300 need to stretch into the liquid level below, the central shaft rod 100 can drive the paddle assemblies 500 to stir liquid in a rotating manner, and the central shaft rod 100 does not need to be in contact with liquid, the liquid cannot climb along the central shaft rod 100, and the improvement of the mixing effect of viscous liquid is facilitated.

On the basis of the above embodiments, further, the blade assembly 500 in the stirring mechanism provided by the present embodiment includes a stirring inner blade 510 and a stirring outer blade 520; the stirring inner blade 510 is disposed to be symmetrical to the stirring outer blade 520 about the central axis of the first foot bar 200 after rotating about the central axis of the length direction by a first angle, which is set to 0 to 180 °.

Specifically, stirring inner leaf 510 and first foot board outer leaf all can set up to dull and stereotyped or curved surface shape's stirring vane, stirring inner leaf 510 accessible welded mode is connected with first foot pole 200 or second foot pole 300, the preferred, stirring inner leaf 510 is disposed and is symmetrical about the central axis of first foot pole 200 with stirring outer leaf 520 after rotating 90 around self length direction's the central axis, the direction of rotation of stirring inner leaf 510 can set up to clockwise or anticlockwise, the angle that staggers of the edge of stirring inner leaf 510 and the edge of stirring outer leaf 520 this moment is the biggest, it is better to the stirring mixed effect of liquid.

As an optional implementation manner of this embodiment, the blade assembly 500 includes a stirring inner blade 510, a stirring outer blade 520, and a connecting sleeve 530, the connecting sleeve 530 is configured as a metal circular tube, and the stirring inner blade 510 and the stirring outer blade 520 are respectively welded on the connecting sleeve 530; the connecting sleeve 530 is sleeved on the first leg member 200, and the connecting sleeve 530 is fixed on the first leg member 200 by welding, or the connecting sleeve 530 is connected with the first leg member 200 by interference, or the connecting sleeve 530 is fixed on the first leg member 200 by bolts. The connection sleeve 530 is connected to the second leg 300 in the same manner as the first leg 200, and thus, will not be described in detail.

Further, the stirring inner blade 510 includes a first stirring plate, and the stirring outer blade 520 includes a second stirring plate; the first leg shaft 200 and the central shaft 100 are in a first plane, and a first included angle is formed between the plane of the first stirring plate and the first plane.

Specifically, the first stirring flat plate and the second stirring flat plate are both arranged into plate-shaped structures, and the outer contours of the plate-shaped structures can be arranged into various shapes; the plane formed by the axis of the first leg rod 200 and the axis of the central shaft rod 100 is set as a first plane, and a first included angle between the plane of the first stirring plate and the first plane is a complementary obtuse angle or an acute angle, preferably, the first included angle refers to an acute angle; after the position of the first stirring plate is determined, since the stirring inner blade 510 rotates by a first angle around the axial center axis of the stirring inner blade in the longitudinal direction thereof and the stirring outer blade 520 is symmetrical with respect to the central axis of the first leg 200, the position of the second stirring plate is also determined accordingly.

Further, the first included angle is set to 0 ° to 90 °.

Specifically, when the first included angle is set to be 0 degree, the plane where the first stirring flat plate is located is superposed with the first plane; when the first included angle is set to be 90 degrees, the plane where the first stirring flat plate is located is vertical to the first plane. When central axostylus axostyle 100 is vertical to be placed, first plane also is vertical plane, is provided with first contained angle between first stirring flat place plane and the vertical plane, and viscous liquid easily is twist form and removes under the drive of first stirring flat and second stirring flat, does benefit to the misce bene of liquid.

Further, the first stirring flat plate and the second stirring flat plate are both rectangular flat plates, and the ratio of the length of the first stirring flat plate to the length of the first stirring flat plate is set to be 10: 1-1: 1.

Specifically, the first stirring plate and the second stirring plate can be rectangular plates made of metal or other materials, and preferably, the first stirring plate and the second stirring plate are both rectangular stainless steel plates; the length of the first stirring plate is equal to that of the second stirring plate, or the length of the first stirring plate is greater than that of the second stirring plate, and when the ratio of the length of the first stirring plate to that of the second stirring plate changes, the distance between the first foot bar 200 and the second foot bar 300 is also correspondingly adjusted; so set up for wait that mixed liquid is mainly misce bene under the stirring of first stirring flat board, can reduce the probability of viscous solution on the inner wall of container.

The rabbling mechanism that this embodiment provided, leaf 510 includes first stirring flat board in through the stirring, and stirring outer leaf 520 includes the second stirring flat board, is provided with first contained angle between first stirring flat board place plane and the first plane, and the length of first stirring flat board is more than or equal to the length of second stirring flat board for wait that stirring liquid can be the twist form under the effect of first stirring flat board and remove, do benefit to the misce bene of liquid.

On the basis of the above embodiment, further, the stirring inner blade 510 and the stirring outer blade 520 in the stirring mechanism provided in the present embodiment are both provided with a twisted curved surface.

Specifically, as shown in fig. 2, the left end of the inner stirring blade 510 is connected to the first leg rod 200, the right end of the inner stirring blade 510 is twisted clockwise or counterclockwise by a certain angle with respect to the left end to form a twisted curved surface, and the structure of the outer stirring blade 520 is the same as that of the inner stirring blade 510; the stirring inner blade 510 and the stirring outer blade 520 of the torsional curved surface structure increase the contact area with liquid, can improve the disturbance capacity of the liquid, and are favorable for improving the mixing effect of viscous liquid.

Further, the stirring mechanism further includes at least one third leg bar 600 disposed in parallel with the central shaft bar 100; the top end of the third foot bar 600 is connected with the central shaft bar 100 through the connecting rod 400, and the third foot bar 600 is provided with the paddle assembly 500; the first leg 200, the second leg 300, and the third leg 600 are evenly spaced around the central axis of the central shaft 100.

Specifically, as shown in fig. 3, at least one third leg 600 is provided, and the top end of the third leg 600 is also connected to the bottom end of the central shaft 100 through a connecting rod; when the third leg 600 is provided as one, the plane of the first leg 200 and the central shaft 100, the plane of the second leg 300 and the central shaft 100, and the plane of the third leg 600 and the central shaft 100 form an included angle of 120 °, and the same situation applies when two or more third legs 600 are provided.

Further, the first foot bar 200 and the second foot bar 300 are arranged in equal length, and the ratio of the minimum linear distance between the stirring inner blade 510 on the first foot bar 200 and the corresponding stirring inner blade 510 on the second foot bar 300 or the third foot bar 600 to the length of the first foot bar 200 is set to be 1: 50-1: 2.

Specifically, the structure of the stirring inner blade 510 on the first leg bar 200 is the same as that of the corresponding stirring inner blade 510 on the second leg bar 300 or the third leg bar 600, and when the ratio of the minimum linear distance between the stirring inner blade 510 on the first leg bar 200 and the corresponding stirring inner blade 510 on the second leg bar 300 or the third leg bar 600 is determined, the relative position of the stirring inner blade 510 on the second leg bar 300 or the third leg bar 600 is also determined; the length of the first leg 200 is greater than the minimum linear distance, and a stirring space is reserved for the stirring inner blades 510 on different legs to stir the liquid near the central axis of the container, so that the liquid near the central axis of the container is fully mixed mainly under the shearing action of the stirring inner blades 510.

Further, as shown in fig. 4, the number of paddle assemblies 500 on the first foot bar 200, the second foot bar 300 and the third foot bar 600 is equal, and a plurality of paddle assemblies are provided; the paddle assemblies 500 are uniformly arranged layer by layer at intervals along the axial direction of the corresponding foot rods, and the ratio of the minimum linear distance between every two adjacent layers of the paddle assemblies 500 to the length of the first foot rod 200 is 1:1-1: 50; the included angle between the planes of the two stirring inner blades 510 in the two adjacent layers of blade assemblies 500 is set to be 0-180 degrees.

Specifically, the following describes an arrangement structure of the plurality of paddle assemblies 500 by taking an example in which the plurality of paddle assemblies 500 are arranged on the first foot bar 200; the stirring inner blades 510 and the stirring outer blades 520 are both rectangular flat plates, and when the ratio of the minimum linear distance between two adjacent layers of blade assemblies 500 to the length of the first foot bar 200 is determined and the included angle between the planes of the two stirring inner blades 510 in the two adjacent layers of blade assemblies 500 is determined, the relative positions of the two adjacent layers of blade assemblies 500 are determined accordingly; the length of the first foot bar 200 is greater than or equal to the minimum linear distance between two adjacent layers of blade assemblies 500, and when the length of the first foot bar 200 is equal to the minimum linear distance between two adjacent layers of blade assemblies 500, the two layers of blade assemblies 500 are respectively arranged at the top end and the bottom end of the first foot bar 200.

When the included angle between the planes of the two stirring inner blades 510 in the two adjacent layers of blade assemblies 500 is set to be 0 °, the planes of the two stirring inner blades 510 in the two adjacent layers of blade assemblies 500 are coplanar, and starting from the coplanar planes of the two stirring inner blades 510 in the two adjacent layers of blade assemblies 500, one stirring inner blade 510 can rotate around the central axis of the stirring inner blade in the length direction of the stirring inner blade relative to the other stirring inner blade 510 by 0-180 °.

In the stirring mechanism provided by this embodiment, when the stirring inner blade 510 and the stirring outer blade 520 are both provided with the twisted curved surfaces, the contact areas between the stirring inner blade 510 and the stirring outer blade 520 and the liquid can be increased, the disturbance capability on the liquid is further improved, and the mixing effect of the viscous liquid is improved; the paddle assemblies 500 on the first foot bar 200, the second foot bar 300 and the third foot bar 600 are equal in number and are all arranged in a plurality, the number of the paddle assemblies 500 is increased, and the mixing efficiency of viscous liquid is further improved.

On the basis of the above embodiment, further, the stirring device provided by the present embodiment includes a driving portion, a liquid storage portion, and a stirring mechanism; the drive division is installed in the stock solution portion, and the drive division is connected with the transmission of center pin pole 100, and the drive division drives paddle subassembly 500 through center pin pole 100 and rotates around center pin pole 100.

Specifically, the liquid storage part can be set as a liquid storage tank, the driving part can be set as a driving motor, the driving motor is mounted on the liquid storage tank, and the stirring mechanism is arranged in the liquid storage tank, so that the central shaft rod 100 drives the plurality of blade assemblies to extend into the liquid to be stirred through the plurality of foot rods respectively, and the central shaft rod does not need to be in contact with the liquid to be stirred; the central shaft 100 can be connected with the driving shaft of the driving motor through the shaft coupling, so that the driving motor drives the plurality of paddle assemblies 500 to stir the viscous liquid in the liquid storage tank through the central shaft 100.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A stirring mechanism, comprising: a central shaft (100), a first leg bar (200), and a second leg bar (300);

the first foot rod (200) and the second foot rod (300) are both arranged in parallel with the central shaft rod (100), and the top end of the first foot rod (200) and the top end of the second foot rod (300) are both connected with the central shaft rod (100) through a connecting rod (400);

the first foot rod (200) and the second foot rod (300) are provided with paddle components (500), and the paddle components (500) are used for extending into the liquid to be stirred to stir the liquid.

2. The stirring mechanism of claim 1, wherein the paddle assembly (500) comprises a stirring inner lobe (510) and a stirring outer lobe (520);

the stirring inner blade (510) is configured to be symmetrical to the stirring outer blade (520) about the central axis of the first foot bar (200) after rotating around the central axis of the length direction of the stirring inner blade by a first angle, and the first angle is set to be 0-180 degrees.

3. The stirring mechanism of claim 2, wherein the stirring inner blade (510) comprises a first stirring flat plate, and the stirring outer blade (520) comprises a second stirring flat plate;

the first foot rod (200) and the central shaft rod (100) are located in a first plane, and a first included angle is formed between the plane of the first stirring plate and the first plane.

4. A mixing mechanism according to claim 3, wherein said first included angle is set at between 0 ° and 90 °.

5. The stirring mechanism of claim 2, wherein the stirring inner blade (510) and the stirring outer blade (520) are each provided as a twisted curved surface.

6. The stirring mechanism according to claim 4, wherein the first stirring plate and the second stirring plate are both rectangular parallelepiped plates, and the ratio of the length of the first stirring plate to the length of the second stirring plate is 10: 1-1: 1.

7. Stirring mechanism according to claim 6, further comprising at least one third foot bar (600) arranged parallel to the central shaft (100);

the top end of the third foot bar (600) is connected with the central shaft lever (100) through the connecting rod (400), and the blade assembly (500) is arranged on the third foot bar (600);

the first foot bar (200), the second foot bar (300) and the third foot bar (600) are uniformly arranged around the central axis of the central shaft lever (100) at intervals.

8. The stirring mechanism according to claim 7, characterized in that the first foot bar (200), the second foot bar (300) and the third foot bar (600) are arranged in equal length, and the ratio of the minimum linear distance between the stirring inner blade (510) on the first foot bar (200) and the corresponding stirring inner blade (510) on the second foot bar (300) or the third foot bar (600) to the length of the first foot bar (200) is set to be 1: 50-1: 2.

9. The stirring mechanism of claim 8, wherein the number of paddle assemblies (500) on the first foot bar (200), the second foot bar (300) and the third foot bar (600) is equal and is provided in plurality; the paddle components (500) are uniformly arranged layer by layer at intervals along the axial direction of the corresponding foot rods, and the ratio of the minimum linear distance between two adjacent layers of the paddle components (500) to the length of the first foot rod (200) is 1:1-1: 50;

the included angle between the planes of the two stirring inner blades (510) in the two adjacent layers of blade assemblies (500) is set to be 0-180 degrees.

10. A stirring device comprising a driving portion, a liquid storage portion, and the stirring mechanism according to any one of claims 1 to 9;

the driving part is installed in the liquid storage part, is in transmission connection with the central shaft rod (100), and drives the blade assembly (500) to rotate around the central shaft rod (100) through the central shaft rod (100).

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