A bidirectional stirring structure, device and method

Abstract

The present application discloses a bidirectional stirring structure, device, and method, comprising a main shaft, the main shaft comprising a first end and a second end, and further comprising: at least one forward-spinning helical ribbon, the forward-spinning helical ribbon extending in a right-handed spiral direction around the main shaft along the first end toward the second end, the effective radius of the forward-spinning helical ribbon near the first end being smaller than the effective radius of the forward-spinning helical ribbon near the second end; and at least one reverse-spinning helical ribbon extending in a left-handed spiral direction around the main shaft along the first end toward the second end, the effective radius of the reverse-spinning helical ribbon near the first end being larger than the effective radius of the reverse-spinning helical ribbon near the second end. The bidirectional stirring structure, device, and method of the present application have a simple structure and more uniform mixing.

Description

Technical Field

[0001] The present application relates to the field of mixing and stirring technology, and in particular to a bidirectional stirring structure, device and method. Background Art

[0002] The rapid development of the new energy industry has led to a shortage of lithium battery raw materials, and stirring is an important process. From the perspective of the state of the stirring medium, stirring is divided into solid stirring, liquid stirring, and powder stirring. From the perspective of purpose, there are reaction, mixing, separation, heat transfer, etc. There are many types of stirrers. The outer diameter of the spiral ribbon of the spiral ribbon stirrer is equal to the pitch. It is specially used for stirring high-viscosity (200-500 Pa·S) liquids and pseudo-plastic fluids, and is usually operated in a laminar state. In view of the characteristics of the powder of lithium battery negative electrode materials, the structure of the traditional spiral ribbon stirring system cannot fully meet the requirements of uniform mixing in production. Summary of the Invention

[0003] In order to solve the above technical problems, the present application provides a bidirectional stirring structure, device and method, which can improve the uniformity of material mixing.

[0004] In a first aspect, the present application provides a bidirectional stirring structure, which adopts the following technical solution: a bidirectional stirring structure, comprising a main shaft, the main shaft comprising a first end and a second end, and further comprising:

[0005] At least one positive spiral band connected to the main shaft, the positive spiral band extending in a right-hand spiral direction around the main shaft from the first end to the second end, and the effective radius of the positive spiral band near the first end is smaller than the effective radius of the positive spiral band near the second end;

[0006] At least one reverse helical ribbon is connected to the main shaft, and the reverse helical ribbon extends in a left-hand spiral direction around the main shaft from the first end to the second end, and the effective radius of the reverse helical ribbon near the first end is greater than the effective radius of the reverse helical ribbon near the second end.

[0007] By adopting this technical solution, compared to conventional cross-staggered ribbons, this structure uses a completely continuous ribbon structure, increasing the contact area between the stirring system and the material by approximately 22%, effectively avoiding the occurrence of dead corners that lead to uneven mixing and affect product quality. This solution uses a single main shaft to simultaneously drive the forward and reverse spiral ribbons to rotate and promote material mixing. The different rotation directions and diameters of the forward and reverse spiral ribbons achieve alternating material circulation, ensuring more uniform mixing.

[0008] In combination with the first aspect, a further solution includes two groups of rotating spiral ribbons, the two groups of rotating spiral ribbons include a first group of rotating spiral ribbons and a second group of rotating spiral ribbons, the first group of rotating spiral ribbons and the second group of rotating spiral ribbons each include a forward-rotating spiral ribbon and a reverse-rotating spiral ribbon, and the second group of rotating spiral ribbons is configured to rotate the first group of rotating spiral ribbons 180° around the main shaft axis after mirroring the first group of rotating spiral ribbons relative to the main shaft cross section.

[0009] By adopting the above technical solution, the two sets of rotating ribbons improve the efficiency and uniformity of mixing. The two sets of ribbons are mirrored and rotated 180 degrees relative to the main axis, which can achieve cross-circulation of the two sets of ribbons, making the mixing more complete and uniform.

[0010] In combination with the first aspect, in a further solution, the first group of rotating spiral ribbons is closer to the first end than the second group of rotating spiral ribbons.

[0011] By adopting the above technical solution, the forward-rotating spiral belts of the first group of rotating spiral belts and the forward-rotating spiral belts of the second group of rotating spiral belts can be staggered in sections one after another to push the material along the main axis to the first end, and the reverse-rotating spiral belts of the first group of rotating spiral belts and the reverse-rotating spiral belts of the second group of rotating spiral belts can be staggered in sections one after another to push the material along the main axis to the middle position between the first end and the second end, thereby improving the transmission efficiency of the material at the first end, making the pushing more sufficient, and making each spiral belt more evenly stressed.

[0012] In combination with the first aspect, in a further solution, the second group of rotating spiral ribbons is closer to the second end than the first group of rotating spiral ribbons.

[0013] By adopting the above technical solution, the forward-rotating spiral belts of the first group of rotating spiral belts and the forward-rotating spiral belts of the second group of rotating spiral belts can be staggered in sections one after another to push the material along the main axis from the second section to the first end, and the reverse-rotating spiral belts of the first group of rotating spiral belts and the reverse-rotating spiral belts of the second group of rotating spiral belts can be staggered in sections one after another to push the material along the main axis from the middle position between the first end and the second end to the second end, thereby improving the transmission efficiency of the material at the second end, making the pushing more sufficient, and making each spiral belt more evenly stressed.

[0014] In combination with the first aspect, in a further solution, the forward-rotating helical band and the reverse-rotating helical band are arranged opposite to the main axis at the first end, and the forward-rotating helical band and the reverse-rotating helical band are arranged opposite to the main axis at the second end.

[0015] By adopting the above technical solution, the two spiral belts can be cross-staggered, so that the material pushed to the first end by the forward-rotating spiral belt has a time interval before being pushed to the second end by the reverse-rotating spiral belt, and the material pushed to the second end by the reverse-rotating spiral belt also has a time interval before being pushed to the first end by the forward-rotating spiral belt, so that the material pushing is more sufficient.

[0016] In combination with the first aspect, in a further solution, the ratio of the maximum effective radius to the minimum effective radius of the positive spiral band is in the range of 1.5:1-2:1.

[0017] By adopting the above technical solution, the forward-rotating spiral ribbon can stir the materials more fully in the entire stirring and mixing space, avoiding dead corners.

[0018] In combination with the first aspect, in a further solution, the ratio of the maximum effective radius to the minimum effective radius of the anti-rotating helical ribbon is in the range of 1.5:1-2:1.

[0019] By adopting the above technical solution, the counter-rotating spiral ribbon can stir the materials more fully in the entire stirring and mixing space, avoiding dead corners.

[0020] In combination with the first aspect, in a further solution, the forward spiral band and the reverse spiral band of the first group of rotating spiral bands have the same pitch, and the forward spiral band extends one quarter to one third longer than the reverse spiral band.

[0021] By adopting the above technical solution, it can be ensured that the distance of material conveyed in the radial direction is staggered, further improving the efficiency and sufficiency of material conveying.

[0022] In a second aspect, the present application provides a bidirectional stirring device, comprising the bidirectional stirring structure as described above.

[0023] By adopting the above technical solution, the stirring and mixing is more thorough and uniform, the external heat exchange is more sufficient, the service life of the equipment is increased, and the failure rate is reduced.

[0024] In a third aspect, the present application provides a bidirectional stirring method, comprising the bidirectional stirring structure described in the first aspect, the bidirectional stirring method comprising:

[0025] The main shaft rotates;

[0026] The first group of rotating spiral ribbons works: the forward-rotating spiral ribbons of the first group of rotating spiral ribbons push the material from the second end to the first end, and the reverse-rotating spiral ribbons push the material from the first end to the second end;

[0027] The second group of rotating spiral ribbons works: the forward-rotating spiral ribbons of the second group of rotating spiral ribbons push the material from the second end to the first end, and the reverse-rotating spiral ribbons push the material from the first end to the second end;

[0028] Flipping: the counter-rotating spiral ribbons of the first group of rotating spiral ribbons push the material pushed to the first end by the forward-rotating spiral ribbons from the first end to the second end; the forward-rotating spiral ribbons of the second group of rotating spiral ribbons push the material pushed to the second end by the counter-rotating spiral ribbons from the second end to the first end;

[0029] mix:

[0030] After the materials pushed by the forward-rotating spirals of the first group of rotating spirals and the materials pushed by the reverse-rotating spirals collide with each other and mix, the materials tumble toward the main shaft, and the forward-rotating spirals push the mixed materials toward the first end, and the reverse-rotating spirals push the mixed materials toward the second end;

[0031] After the material pushed by the forward-rotating spiral ribbon of the second group of rotating spiral ribbons and the material pushed by the reverse-rotating spiral ribbon collide with each other and mix, the material rolls toward the main shaft, the forward-rotating spiral ribbon pushes the mixed material toward the first end, and the reverse-rotating spiral ribbon pushes the mixed material toward the second end.

[0032] By adopting the above technical solution, the materials are mixed more evenly, with better consistency and high mixing efficiency.

[0033] In summary, this application has at least one of the following beneficial technical effects:

[0034] 1. The bidirectional stirring structure of this application has a simpler structure and more stable performance.

[0035] 2. The bidirectional stirring structure of this application makes mixing more complete and uniform, and the mixing efficiency is higher.

[0036] 3. The bidirectional stirring device of this application can stir and mix more fully and evenly, and the external heat exchange is more sufficient, thereby increasing the service life of the equipment and reducing the failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural schematic diagram of the bidirectional stirring structure of the present application;

[0038] Figure 2 This is a schematic diagram of the front structure of the bidirectional stirring structure of the present application;

[0039] Figure 3 It is a structural diagram of the spindle fit;

[0040] Figure 4 It is a schematic diagram of the front structure of the spindle fit;

[0041] Figure 5 1. It is a structural diagram of the positional relationship between the first group of rotating spiral ribbons and the second group of rotating spiral ribbons;

[0042] Figure 6 This is a schematic diagram of the working principles of the first set of rotating spiral ribbons and the second set of rotating spiral ribbons.

[0043] Reference numerals:

[0044] 1. Main shaft; 11. First end; 12. Second end; 2. First group of rotating spiral ribbons; 21. First forward spiral ribbon; 22. First reverse spiral ribbon; 3. Second group of rotating spiral ribbons; 31. Second forward spiral ribbon; 32. Second reverse spiral ribbon; 4. Left push plate; 41. Upper left push plate; 42. Lower left push plate; 5. Right push plate; 51. Upper right push plate; 511. Raised rib; 52. Lower right push plate; 6. Support rod; 61. First support rod; 62. Second support rod; 7. Connecting rod. DETAILED DESCRIPTION

[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more apparent, the present invention will be further described in detail below with reference to the accompanying drawings. The components of the embodiments of the present invention generally described and illustrated in the accompanying drawings can be arranged and designed in a variety of different configurations. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without inventive effort are intended to fall within the scope of protection of the present invention.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0047] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0048] In the description of this application, it should be understood that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0049] The following describes some embodiments of the present invention in detail with reference to the accompanying drawings. In the absence of conflict, the features of the following embodiments can be combined with each other.

[0050] Example 1

[0051] See also Figure 1, a schematic structural diagram of an embodiment of a bidirectional stirring structure. The bidirectional stirring structure includes a main shaft 1, the main shaft 1 having a first end 11 and a second end 12, and a first group of rotating spiral ribbons 2 and a second group of rotating spiral ribbons 3 extending along the length direction of the main shaft 1. The first group of rotating spiral ribbons 2 and the second group of rotating spiral ribbons 3 each include two spiral ribbons with different rotation directions. For the purpose of explaining this embodiment, a spiral ribbon extending in a right-hand spiral direction from the first end 11 to the second end 12 of the main shaft 1 is defined as a positive spiral, and a spiral ribbon extending in a positive spiral is a positive spiral ribbon; a spiral ribbon extending in a left-hand spiral direction from the first end 11 to the second end 12 of the main shaft 1 is defined as a reverse spiral, and a spiral ribbon extending in a reverse spiral is a reverse spiral ribbon. The first group of rotating spiral ribbons 2 includes a first positive spiral ribbon 21 and a first reverse spiral ribbon 22, and the second group of rotating spiral ribbons 3 includes a second positive spiral ribbon 31 and a second reverse spiral ribbon 32. The forward and reverse helical bands have the same pitch, wherein the first forward helical band 21 extends one quarter to one third longer than the first reverse helical band 22 , and the second reverse helical band 32 extends one quarter to one third longer than the second forward helical band 31 .

[0052] A left push plate 4 is fixed to the first end 11 of the main shaft 1, and a right push plate 5 is fixed to the second end 12 of the main shaft 1. The main shaft 1 is also fixedly connected to multiple groups of support rods 6 for fixedly supporting the left push plate 4, the right push plate 5, the first group of rotating spiral belts 2, and the second group of rotating spiral belts 3. Each group of support rods 6 is arranged in an array along the length of the main shaft 1 and is perpendicular to the axis of the main shaft 1. The support rods 6 include a first support rod 61 and a second support rod 62 that is staggered and perpendicular to the first support rod 61. Each group of first support rods 61 and second support rods 62 are fixed symmetrically to the axis of the main shaft 1. In specific implementation, each group of first support rods 61 and second support rods 62 can be symmetrically arranged by passing a single support rod 6 through the main shaft 1, or by welding two support rods 6 symmetrically to the main shaft 1. The first support rod 61 near the first end 11 of the main shaft 1 is fixedly connected to the left push plate 4 via multiple connecting rods 7. The lower end of the first support rod 61 near the first end 11 of the main shaft 1 is fixedly connected to the left end of the first reverse spiral belt 22. After the first positive spiral belt 21 is fixedly connected to the upper part of the first support rod 61 near the first end 11 of the main shaft 1 near the first end 11, it continues to rotate and extend toward the first end 11 by a quarter of a turn and is fixedly connected to the second support rod 62 near the first end 11.

[0053] The first positive spiral band 21 and the first negative spiral band 22 are arranged opposite to the main shaft 1 at the first end 11. The first positive spiral band 21 first rotates and extends three quarters of a circle from the first end 11 to the second end 12 with a small radius, and then the first positive spiral band 21 rotates a quarter of a circle with a radius changing from a small radius to a large radius, and finally the first positive spiral band 21 rotates another half circle with a large radius. The first negative spiral band 22 first rotates and extends one half circle with a small radius from the first end 11 to the second end 12 with a large radius. The ratio of the large radius to the small radius is in the range of 1.5:1-2:1, and the optimal ratio is 1.5:1. In actual applications, it can also be appropriately adjusted according to the stirring diameter during specific implementation.

[0054] The second positive spiral band 31 and the second negative spiral band 32 are arranged opposite to the main axis 1 at the second end 12. The second positive spiral band 31 first rotates and extends half a circle with a large radius from the second end 12 to the first end 11, and then the second positive spiral band 31 rotates a quarter of a circle with a radius changing from a large radius to a small radius, and then rotates half a circle with a small radius. The second negative spiral band 32 first rotates and extends half a circle with a small radius from the second end 12 to the first end 11 with a small radius, and then rotates a quarter of a circle with a radius changing from a small radius to a large radius, and finally rotates and extends half a circle with a large radius. The radius mentioned above is the effective radius, wherein the ratio of the large radius to the small radius ranges from 1.5:1 to 2:1, and the optimal is 1.5:1. In actual applications, it can also be appropriately changed according to the stirring diameter during specific implementation.

[0055] The first forward-rotating helical ribbon 21, the first reverse-rotating helical ribbon 22, the second forward-rotating helical ribbon 31, and the second reverse-rotating helical ribbon 32 are alternately fixedly connected to the first support rod 61 and the second support rod 62 during the process of rotating and extending along the main axis 1, so as to ensure the strength of the first forward-rotating helical ribbon 21, the first reverse-rotating helical ribbon 22, the second forward-rotating helical ribbon 31, and the second reverse-rotating helical ribbon 32 during the stirring process.

[0056] Through the above structural arrangement, the bidirectional stirring structure of this embodiment can achieve bidirectional stirring in the rotation direction shown in the figure, making the stirring more uniform and sufficient.

[0057] See also Figure 2The first forward spiral ribbon 21, the first reverse spiral ribbon 22, the second forward spiral ribbon 31, and the second reverse spiral ribbon 32 are all complete spiral ribbons with continuous curvature. The change in diameter of each spiral ribbon can also be intuitively seen in the figure. The first forward spiral ribbon 21, the first reverse spiral ribbon 22, the second forward spiral ribbon 31, and the second reverse spiral ribbon 32 are symmetrically arranged along the centerline of the main shaft 1, forming two large peaks, two large troughs, and two symmetrical small peaks and two small troughs. The second group of rotating spiral ribbons 3 is configured by mirroring the cross-section of the first group of rotating spiral ribbons 2 relative to the centerline of the main shaft 1 and rotating it 180° around the axis of the main shaft 1.

[0058] See also Figure 3 and Figure 4 The first support rod 61, the second support rod 62 and the main shaft 1 are respectively arranged perpendicular to each other, the first support rod 61 is arranged in an array along the axis direction of the main shaft 1, the second support rod 62 is arranged in an array crosswise with the first support rod 61, and the interval between the first support rod 61 and the adjacent second support rod 62 is equal. The left push plate 4 includes an upper left push plate 41 and a lower left push plate 42 arranged opposite to the main shaft 1. The upper left push plate 41 is fixedly connected to the upper part of the first support rod 61 through the connecting rod 7, and the lower left push plate 42 is fixedly connected to the lower part of the first support rod 61 through the connecting rod 7. The right push plate 5 includes an upper right push plate 51 and a lower right push plate 52 arranged opposite to the main shaft 1. The upper right push plate 51 is fixedly connected to the upper part of the first support rod 61 through the connecting rod 7, and the lower right push plate 52 is fixedly connected to the lower part of the first support rod 61 through the connecting rod 7. The upper right push plate 51 is also provided with a convex rib 511, which is used to push the stirred material toward the center of the shaft during the stirring process. The lower right push plate 52, the upper left push plate 41 and the lower left push plate 42 are also provided with a convex rib 511 (not shown in the figure), which has the same function as the convex rib 511 of the upper right push plate 51.

[0059] See also Figure 5 The first forward-rotating spiral ribbon 21, the first reverse-rotating spiral ribbon 22, the second forward-rotating spiral ribbon 31, and the second reverse-rotating spiral ribbon 32 are staggered and do not interfere with each other during the rotation and extension process. The curvature of the spiral surface of the first forward-rotating spiral ribbon 21, the first reverse-rotating spiral ribbon 22, the second forward-rotating spiral ribbon 31, and the second reverse-rotating spiral ribbon 32 is continuous, which can ensure the continuity of stirring and also improve the service life of the first forward-rotating spiral ribbon 21, the first reverse-rotating spiral ribbon 22, the second forward-rotating spiral ribbon 31, and the second reverse-rotating spiral ribbon 32.

[0060] See also Figure 6The first set of rotating spiral ribbons 2 and the second set of rotating spiral ribbons 3 rotate in the direction of the curved arrows in the figure. The first forward-rotating spiral ribbons 21 and the second forward-rotating spiral ribbons 31 push the material to the left, and the first reverse-rotating spiral ribbons 22 and the second reverse-rotating spiral ribbons 32 push the material to the right. The pushing direction of the first set of rotating spiral ribbons 2 is indicated by a solid arrow, and the pushing direction of the second set of rotating spiral ribbons 3 is indicated by a dotted arrow. The first forward-rotating spiral ribbon 21, located at a large radius near the centerline, pushes in an opposite direction to the first reverse-rotating spiral ribbon 22, located at a large radius near the centerline. The material at the centerline moves toward the axis of the main shaft 1 under the push of the first forward-rotating spiral ribbons 21 and the first reverse-rotating spiral ribbons 22. As the material moves toward the main shaft 1, it is pushed away from the centerline by the small-radius spirals at the centerline of the second forward-rotating spiral 31 and the second reverse-rotating spiral 32, respectively, toward the two ends of the main shaft 1. The material pushed to the left is pushed toward the centerline by the large-radius spiral at the left end of the first reverse-rotating spiral 22, and is further pushed toward the centerline by the second reverse-rotating spiral 32. The material pushed to the right is pushed toward the centerline by the large-radius spiral at the right end of the second forward-rotating spiral 31. After mixing with the material pushed in the opposite direction of the second reverse-rotating spiral 32 at the centerline, it moves toward the axis and is subsequently pushed toward the left and right ends of the axis by the small-radius spirals at the centerline of the first forward-rotating spiral 21 and the first reverse-rotating spiral 22, respectively. This is repeated to achieve internal and external tumbling and forward and reverse stirring of the material, achieving full stirring of the material and making the stirring more uniform.

[0061] Example 2

[0062] This embodiment provides a bidirectional stirring device, comprising the bidirectional stirring structure described in Example 1, a drive mechanism, and a speed regulating mechanism. The drive mechanism drives the bidirectional stirring structure to rotate via the speed regulating mechanism. The drive mechanism is a motor, and the speed regulating mechanism is a speed reducer. Depending on the specific application, the drive mechanism can also be a manual rotation mechanism, and the speed regulating mechanism can be a gear speed regulating mechanism, a pulley speed regulating mechanism, or implemented by a motor with adjustable speed.

[0063] Example 3

[0064] This embodiment provides a bidirectional stirring method, which is applicable to the bidirectional stirring structure of embodiment 1. The method includes the following steps:

[0065] Spindle 1 rotates;

[0066] The first set of rotating spiral ribbons 2 works: the forward-rotating spiral ribbons of the first set of rotating spiral ribbons 2 push the material from the second end 12 to the first end 11, and the reverse-rotating spiral ribbons push the material from the first end 11 to the second end 12;

[0067] The second set of rotating spiral ribbons 3 works: the forward-rotating spiral ribbons of the second set of rotating spiral ribbons 3 push the material from the second end 12 to the first end 11 , and the reverse-rotating spiral ribbons push the material from the first end 11 to the second end 12 ;

[0068] Flipping: The counter-rotating spiral ribbons of the first group of rotating spiral ribbons 2 push the material pushed by the forward-rotating spiral ribbons to the first end 11 from the first end 11 to the second end 12; the forward-rotating spiral ribbons of the second group of rotating spiral ribbons 3 push the material pushed by the counter-rotating spiral ribbons to the second end 12 from the second end 12 to the first end 11;

[0069] mix:

[0070] The materials pushed by the forward-rotating spirals of the first set of rotating spirals 2 collide with each other and mix, and then the materials roll toward the main shaft 1. The forward-rotating spirals push the mixed materials toward the first end 11, and the reverse-rotating spirals push the mixed materials toward the second end 12.

[0071] After the materials pushed by the forward-rotating spiral ribbons of the second group of rotating spiral ribbons 3 collide and mix with each other, the materials roll toward the main shaft 1 , and the forward-rotating spiral ribbons push the mixed materials toward the first end 11 , while the reverse-rotating spiral ribbons push the mixed materials toward the second end 12 .

[0072] The basic principles, main features, and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. The present invention is subject to various changes, modifications, substitutions, and variations without departing from the spirit and scope of the present invention. Such changes, modifications, substitutions, and variations fall within the scope of the invention as claimed.

Claims

1. A bidirectional stirring structure, comprising a main shaft (1), wherein the main shaft (1) comprises a first end (11) and a second end (12), characterized in that: Also includes: At least one positive spiral band is connected to the main shaft (1), the positive spiral band surrounds the main shaft (1) and extends in a right-hand spiral direction from the first end (11) to the second end (12), and the effective radius of the positive spiral band near the first end (11) is smaller than the effective radius of the positive spiral band near the second end (12); At least one counter-rotating helical ribbon is connected to the main shaft (1), the counter-rotating helical ribbon extends in a left-hand spiral direction around the main shaft (1) along the first end (11) toward the second end (12), and the effective radius of the counter-rotating helical ribbon near the first end (11) is greater than the effective radius of the counter-rotating helical ribbon near the second end (12); The invention also comprises: two groups of rotating spiral ribbons, the two groups of rotating spiral ribbons comprising a first group of rotating spiral ribbons (2) and a second group of rotating spiral ribbons (3), the first group of rotating spiral ribbons (2) and the second group of rotating spiral ribbons (3) each comprising a forward-rotating spiral ribbon and a reverse-rotating spiral ribbon, the second group of rotating spiral ribbons (3) being configured to rotate the first group of rotating spiral ribbons (2) by 180° around the axis of the main shaft (1) after mirroring the cross section of the first group of rotating spiral ribbons relative to the main shaft (1); The forward spiral band and the reverse spiral band of the first group of rotating spiral bands (2) have the same pitch, and the forward spiral band extends one quarter to one third longer than the reverse spiral band.

2. The bidirectional stirring structure according to claim 1, characterized in that: The first group of rotating spiral ribbons (2) is closer to the first end (11) than the second group of rotating spiral ribbons (3).

3. The bidirectional stirring structure according to claim 2, characterized in that: The second group of rotating spiral ribbons (3) is closer to the second end (12) than the first group of rotating spiral ribbons (2).

4. The bidirectional stirring structure according to claim 1, characterized in that: The forward-rotating helical band and the reverse-rotating helical band are arranged opposite to each other relative to the main axis (1) at the first end (11), and the forward-rotating helical band and the reverse-rotating helical band are arranged opposite to each other relative to the main axis (1) at the second end (12).

5. The bidirectional stirring structure according to claim 1, characterized in that: The ratio of the maximum effective radius to the minimum effective radius of the positive spiral band is in the range of 1.5:1-2:

1.

6. The bidirectional stirring structure according to claim 5, characterized in that: The ratio of the maximum effective radius to the minimum effective radius of the anti-rotating helical band is in the range of 1.5:1 to 2:

1.

7. A bidirectional stirring device, characterized in that: It comprises the bidirectional stirring structure as described in any one of claims 1 to 6.

8. A bidirectional stirring method, characterized in that: The bidirectional stirring structure according to claim 3 is included, and the bidirectional stirring method includes: The main shaft (1) rotates; The first group of rotating spiral ribbons (2) works: the forward-rotating spiral ribbons of the first group of rotating spiral ribbons (2) push the material from the second end (12) to the first end (11), and the reverse-rotating spiral ribbons push the material from the first end (11) to the second end (12); The second group of rotating spiral ribbons (3) works: the forward-rotating spiral ribbons of the second group of rotating spiral ribbons (3) push the material from the second end (12) to the first end (11), and the reverse-rotating spiral ribbons push the material from the first end (11) to the second end (12); Flipping: the counter-rotating spiral of the first group of rotating spiral ribbons (2) pushes the material pushed by the forward-rotating spiral ribbon to the first end (11) from the first end (11) to the second end (12); the forward-rotating spiral of the second group of rotating spiral ribbons (3) pushes the material pushed by the counter-rotating spiral ribbon to the second end (12) from the second end (12) to the first end (11); mix: After the materials pushed by the forward-rotating spirals of the first group of rotating spirals (2) and the materials pushed by the reverse-rotating spirals collide with each other and mix, the materials roll toward the main shaft (1), the forward-rotating spirals push the mixed materials toward the first end (11), and the reverse-rotating spirals push the mixed materials toward the second end (12); After the materials pushed by the forward-rotating spiral ribbons of the second group of rotating spiral ribbons (3) and the materials pushed by the reverse-rotating spiral ribbons collide with each other and mix, the materials roll toward the main shaft (1), and the forward-rotating spiral ribbons push the mixed materials toward the first end (11), and the reverse-rotating spiral ribbons push the mixed materials toward the second end (12).

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