TWI823620B - Stirring device with double rotors - Google Patents

Abstract

A stirring device with double rotors is provided. The stirring device comprises a machine and a stirring unit, wherein the stirring unit comprises an inner rotor, an inner motor, an outer rotor, and an outer motor. The inner and outer rotors are rotated in opposite directions to improve the stirring efficiency of slurry homogenization.

Description

Double rotor mixing device

The invention relates to a stirring device, in particular to a double-rotor stirring device.

Lithium batteries have many advantages over traditional batteries, such as high energy density, high discharge voltage, and light weight. At present, the negative electrode material of lithium batteries mainly uses graphite negative electrode material, which is divided into natural graphite and petroleum coke artificial graphite. Graphite is used as the negative electrode material. The external surface and internal crystal structure of the graphite powder particles are quite different, and the reaction with the electrolyte is uneven. There is a large difference in properties. During the charging process, co-intercalation of solvated lithium ions is prone to occur, causing expansion and collapse of the graphite layer. As more electrolyte is consumed, the irreversible capacity is increased, thus affecting the cycle life.

In this regard, in order to overcome the above shortcomings, amorphous carbon is coated on the surface of carbon or graphite powder. There are many kinds of precursors of amorphous carbon. The coating materials used include phenolic resin, polypropylene and other resin materials, and Petroleum asphalt, coal tar pitch and other asphalt materials, among which the coating of asphalt materials not only coats the surface with a layer of amorphous carbon, but can also significantly reduce the specific surface area of graphite, reduce the irreversible capacity during the first discharge process, and improve First discharge performance.

However, the current method of coating carbon or graphite powder with pitch, such as solid phase coating, is to mix pitch powder with carbon or graphite powder and stir under normal temperature or heating conditions to complete the coating. However, it is difficult to ensure uniformity and uniformity of mixing. The integrity of the asphalt powder coating is unstable, so the production quality is unstable. Vapor phase coating uses alkanes and hydrocarbon gases to decompose carbon at high temperatures and deposit it on the surface of carbon or graphite powder. However, the conditions for vapor phase deposition are relatively harsh and the production cost is high. Liquid phase mixing coating is to knead and coat heated molten asphalt with carbon or graphite powder at 150~300°C, but the coating effect is not good. The molten asphalt is difficult to disperse evenly during the kneading process, so uniformity cannot be achieved. The purpose of coating the surface of carbon or graphite powder particles. In addition, when asphalt is mixed with organic matter, the solvent is evaporated after infiltration, and then carbonized and graphitized, the coating effect is not good. The reason is that the properties of the various components in the asphalt are quite different, making it difficult to dissolve and dissolve well in a specific solvent. Dispersion, even under strong stirring, cannot achieve the ideal wetting and coating effects. If the asphalt solubility is insufficient and the amount of asphalt is increased, the amorphous carbon content after carbonization will be too high, resulting in low material capacity.

Therefore, in order to overcome the shortcomings and deficiencies in the prior art, it is necessary for the present invention to provide an improved dual-rotor stirring device to solve the problems existing in the above conventional technology.

The main purpose of the present invention is to provide a dual-rotor mixing device that utilizes the design of the inner rotor and the outer rotor to rotate in opposite directions to improve the mixing efficiency of slurry homogenization.

In order to achieve the above purpose, the present invention provides a dual-rotor stirring device. The dual-rotor stirring device includes a machine platform and a mixing unit; the machine platform includes a base body, a fixed plate and a bottom plate. The fixed plate and the bottom plate are provided On the base body, the base body has a preparation area, a stirring area and a distillation area, wherein the stirring area is located between the preparation area and the distillation area; the stirring unit is arranged on the machine platform, and the The stirring unit includes a first track, a first crucible carrying barrel, a first lifting component, a first fastening chuck, an inner ring rotor, an inner ring motor, an outer ring rotor and an outer ring motor. The first track is provided on the bottom plate and extends from the stirring area to the preparation area; the first crucible carrying barrel is used to carry a crucible and is configured to move on the first track, and the first lifting component is configured Between the fixed plate and the bottom plate, the first lifting component is located in the stirring area and is configured to drive the first crucible carrying barrel to rise or fall, the first fastening chuck is provided on the fixed plate, and the first The fastening chuck is located above the first crucible carrying barrel and is configured to cover the first crucible carrying barrel and seal the crucible. The inner ring rotor passes through the first fastening chuck and extends into the crucible. In the pot, the inner ring motor is disposed on the fixed plate, the inner ring motor is located in the stirring area and is configured to drive the inner ring rotor to rotate, the outer ring rotor is disposed on the periphery of the inner ring rotor, and the outer ring motor is disposed on The fixed plate, the outer ring motor is located in the stirring area and is configured to drive the outer ring rotor to rotate, wherein the inner ring rotor and the outer ring rotor are configured to stir a slurry in the crucible, and the inner ring rotor and The outer rotor rotates in the opposite direction.

In one embodiment of the present invention, the first lifting assembly has a first lifting rod and a first pneumatic cylinder. The first pneumatic cylinder is configured to drive the first lifting rod to expand and contract to drive the first crucible carrying barrel. rise or fall.

In one embodiment of the present invention, the stirring unit further includes a first rotating cylinder and a first rotating support frame. The first rotating supporting frame is disposed on the top of the first crucible carrying barrel. The first rotating cylinder It is provided at the bottom of the first lifting rod and is configured to rotate the first rotating support frame so that the first crucible carrying barrel moves from the stirring area to the preparation area along the first track.

In one embodiment of the invention, the path of the first track is semicircular.

In one embodiment of the present invention, the dual-rotor stirring device further includes a fractionation unit disposed on the machine platform. The fractionation unit includes a second track, a second crucible carrying barrel, a second lifting assembly and a second fastening chuck, the second track is provided on the bottom plate and extends from the distillation zone to the stirring zone, the second crucible carrying barrel is used to carry the crucible and perform heating and fractionation of the crucible, Moreover, the second crucible carrying barrel is configured to move on the second track, the second lifting component is disposed between the fixed plate and the bottom plate, the second lifting component is located in the distillation area and is configured to drive the second The crucible carrying barrel rises or falls, the second fastening chuck is provided on the fixed plate, the second fastening chuck is located above the second crucible carrying barrel and is configured to cover the second crucible carrying barrel and sealing the crucible.

In one embodiment of the present invention, the second lifting assembly has a second lifting rod and a second pneumatic cylinder. The second pneumatic cylinder is configured to drive the second lifting rod to expand and contract to drive the second crucible carrying barrel. rise or fall.

In one embodiment of the present invention, the fractionation unit further includes a second rotating cylinder and a second rotating support frame. The second rotating supporting frame is disposed on the top of the second crucible carrying barrel. The second rotating cylinder It is provided at the bottom of the second lifting rod and is configured to rotate the second rotating support frame so that the second crucible carrying barrel moves from the distillation zone to the stirring zone along the second track.

In one embodiment of the invention, the path of the second track is semicircular.

In one embodiment of the present invention, the inner ring rotor has an inner ring driving belt, an inner ring rotating shaft and a stirring blade. The inner ring driving belt is configured to be driven by the inner ring motor to drive the inner ring rotating shaft to rotate. , the stirring blade is arranged at one end of the inner ring rotating shaft.

In one embodiment of the present invention, the outer ring rotor has an outer ring driving belt, an outer ring rotating shaft and a stirring grid. The outer ring driving belt is configured to be driven by the outer ring motor to drive the outer ring rotating shaft. Rotate, and the stirring grid is arranged at one end of the outer ring rotating shaft.

As mentioned above, the dual-rotor mixing device of the present invention drives the high-viscosity coal tar pitch to form a staggered flow field through the counter-rotating design of the inner rotor and the outer rotor. When the two maintain relative rotation speed and shearing effect, It also provides a wide range of silicon slurry disturbance and mixing, allowing high-viscosity asphalt and nano-silica clusters to be homogenized, while reducing equipment space, shortening the time required for the homogenization process, and improving the mixing efficiency of slurry homogenization.

In order to make the above and other objects, features, and advantages of the present invention more apparent and understandable, embodiments of the present invention will be described in detail below along with the accompanying drawings. Furthermore, the directional terms mentioned in the present invention include, for example, up, down, top, bottom, front, back, left, right, inside, outside, side, peripheral, central, horizontal, transverse, vertical, longitudinal, axial, Radial, uppermost or lowermost, etc., are only directions with reference to the attached drawings. Therefore, the directional terms used are to illustrate and understand the present invention, but not to limit the present invention.

Please refer to FIG. 1 and FIG. 2 , which is a dual-rotor mixing device according to an embodiment of the present invention. It is an automated equipment whose function is to produce a mixture of nanoscale silicon and coal tar pitch, which can mix silicon slurry (such as mixing Nanoscale silicon powder and methylnaphthalene oil) and coal tar pitch are homogenized, wherein the dual-rotor mixing device includes a machine 2, a mixing unit 3 and a fractionation unit 4. The detailed structure, assembly relationship and operating principle of each component will be described in detail below.

Continuing to refer to Figures 1 and 2, the machine 2 includes a base 21, a fixed plate 22 and a bottom plate 23. The fixed plate 22 and the bottom plate 23 are arranged on the base 21, and the base 21 has A preparation zone A1, a stirring zone A2 and a distillation zone A3, wherein the stirring zone A2 is located between the preparation zone A1 and the distillation zone A3.

Continuing to refer to Figures 1 and 2, the stirring unit 3 is disposed on the machine platform 2, and the stirring unit 3 includes a first track 31, a first crucible carrying barrel 32, a first lifting component 33, A first fastening chuck 34 , an inner ring rotor 35 , an inner ring motor 36 , an outer ring rotor 37 and an outer ring motor 38 . The first track 31 is disposed on the bottom plate 23 and extends from the stirring area A2 to the preparation area A1.

As shown in FIGS. 3 and 4 , the first crucible carrying barrel 32 is used to carry a crucible 101 (see FIG. 4 ), and the first crucible carrying barrel 32 is configured to move on the first track 31 . The first lifting component 33 is disposed between the fixed plate 22 and the bottom plate 23. The first lifting component 33 is located in the stirring area A2 and the first lifting component 33 is configured to drive the first crucible carrying barrel 32 to rise or decline. The first fastening chuck 34 is disposed on the fixed plate 22, and the first fastening chuck 34 is tightened or loosened through a first chuck pneumatic cylinder 341. The first fastening chuck 34 is located on the The first fastening chuck 34 is above the first crucible carrying barrel 32 and is configured to cover the first crucible carrying barrel 32 and seal the crucible 101 . In this embodiment, the inner ring motor 36 and the outer ring motor 38 are reduction motors.

Continuing to refer to FIG. 1 , FIG. 2 and FIG. 5 , the inner ring rotor 35 passes through the first fastening chuck 34 and extends into the crucible 101 . The inner ring motor 36 is disposed on the fixed plate 22, the inner ring motor 36 is located in the stirring area A2, and the inner ring motor 36 is configured to drive the inner ring rotor 35 to rotate. The outer ring rotor 37 is arranged on the periphery of the inner ring rotor 35 . The outer ring motor 38 is disposed on the fixed plate 22, the outer ring motor 38 is located in the stirring area A2, and the outer ring motor 38 is configured to drive the outer ring rotor 37 to rotate.

Referring to Figures 1 and 2, the first lifting assembly 33 has a first lifting rod 331 and a first pneumatic cylinder 332. The first pneumatic cylinder 332 is configured to drive the first lifting rod 331 to expand and contract to drive the first lifting rod 331. The first crucible carrying barrel 32 rises or falls.

Continuing to refer to Figures 1 and 2, the stirring unit 3 further includes a first rotating cylinder 301 and a first rotating support frame 302. The first rotating support frame 302 is disposed on the top of the first crucible carrying barrel 32. , the first rotating cylinder 301 is disposed at the bottom of the first lifting rod 331 and the first rotating cylinder 301 is configured to rotate the first rotating support frame 302 so that the first crucible carrying barrel 32 moves along the first track 31 moves from the stirring zone A2 to the preparation zone A1. In this embodiment, the path of the first track 31 is semicircular.

Continuing to refer to Figures 1, 2 and 5, the inner ring rotor 35 has an inner ring drive belt 351, an inner ring rotating shaft 352 and an agitating blade 353. The inner ring drive belt 351 is configured to be driven by the inner ring motor. 36 is driven to drive the inner ring rotating shaft 352 to rotate, and the stirring blade 353 is provided at one end of the inner ring rotating shaft 352. The outer ring rotor 37 has an outer ring driving belt 371, an outer ring rotating shaft 372 and a stirring grid 373. The outer ring driving belt 371 is configured to be driven by the outer ring motor 38 to drive the outer ring rotating shaft 372 to rotate. The stirring grid 373 is provided at one end of the outer ring rotating shaft 372 . In this embodiment, the inner rotor 35 and the outer rotor 37 are configured to stir a slurry in the crucible 101, and the inner rotor 35 and the outer rotor 37 rotate in opposite directions, for example, the The inner rotor 35 rotates in the forward direction, and the outer rotor 37 rotates in the reverse direction.

Continuing to refer to Figures 1 and 2, the fractionation unit 4 is disposed on the machine 2, and the fractionation unit 4 is configured to distill and recover the methylnaphthalene oil solvent. The fractionation unit 4 includes a second track 41. A second crucible carrying barrel 42, a second lifting assembly 43 and a second fastening clamp 44. The second rail 41 is provided on the bottom plate 23 and extends from the distillation area A3. to the stirring zone A2. The second crucible carrying barrel 42 is used to carry the crucible 101 and conduct heating and fractionation of the crucible 101 , and the second crucible carrying barrel 42 is configured to move on the second track 41 . The second lifting component 43 is disposed between the fixed plate 22 and the bottom plate 23. The second lifting component 43 is located in the distillation area A3 and is configured to drive the second crucible carrying barrel 42 to rise or decline. The second fastening chuck 44 is disposed on the fixed plate 22, and the second fastening chuck 44 is tightened or loosened through a second chuck pneumatic cylinder 441. The second fastening chuck 44 is located on the The second fastening chuck 44 is above the second crucible carrying barrel 42 and is configured to cover the second crucible carrying barrel 42 and seal the crucible 101 .

Continuing to refer to Figures 1 and 2, the second lifting assembly 43 has a second lifting rod 431 and a second pneumatic cylinder 432. The second pneumatic cylinder 432 is configured to drive the second lifting rod 431 to expand and contract to drive the second lifting rod 431. The second crucible carrying barrel 42 rises or falls.

Continuing to refer to Figures 1 and 2, the fractionation unit 4 further includes a second rotating cylinder 401 and a second rotating support frame 402. The second rotating support frame 402 is disposed on the top of the second crucible carrying barrel 42. , the second rotating cylinder 401 is disposed at the bottom of the second lifting rod 431 and the second rotating cylinder 401 is configured to rotate the second rotating support frame 402 so that the second crucible carrying barrel 42 moves along the second track 41 moves from the distillation zone A3 to the stirring zone A2. In this embodiment, the path of the second track 41 is semicircular.

According to the above structure, after the silicon slurry and coal tar pitch are put into the crucible 101, the crucible 101 is placed in the first crucible carrying barrel 32 located in the preparation area A1, and the first crucible carrying barrel is placed 32 moves along the first track 31 to the stirring area A2 (see Figure 1), and then uses the first lifting assembly 33 to lift the first crucible carrying barrel 32 so that it can be lifted by the first fastening chuck above. 34 is covered and locked to form a closed space, and then the air is automatically pumped and aired in through a flow washing process. The air in the crucible 101 is extracted and then filled with ammonia gas, and filled with ammonia gas to a slightly positive pressure, and then through The pressure holding test program detects whether the crucible 101 can maintain a slight positive pressure.

When the silicon slurry and coal tar pitch in the crucible 101 are to be homogenized and stirred, the outer ring motor 38 is started to drive the stirring grid 373 to rotate through the outer ring drive belt 371 and the outer ring rotating shaft 372. The stirring grid 373 can stir the silicon slurry and coal tar pitch according to the appropriate rotation speed, and at the same time, heat the coal tar pitch to soften the coal tar pitch, and then start the inner ring motor 36 and drive it through the inner ring transmission belt 351 and the inner ring rotating shaft 352 The stirring blade 353 rotates to stir the silicon slurry and coal tar pitch to make them homogeneous. During the stirring process, the rotation of the stirring blade 353 can drive the silicon slurry to enter from the axial direction and then escape from the centrifugal direction. The centrifugal vector when the silicon slurry is separated and the vertical vector of the rotation of the stirring blade 353 form a shearing effect. At the same time, the inner The ring rotating shaft 352 is inside, and the outer ring rotating shaft 372 is outside, and they rotate in opposite directions. The counter-rotating stirring grid 373 has the disturbing and mixing effect of stirring the silicon slurry and coal tar pitch, and has the function of converging the centrifugal force of the silicon slurry. The function of vector enables the asphalt to effectively penetrate into the gaps of the nano-silicon clusters, and the nano-silicon clusters can also be effectively dispersed in the asphalt, thus allowing the silicon slurry and coal tar pitch to be homogenized.

After the homogeneous coking reaction operation of nanoscale silicon and asphalt is completed, the crucible 101 is still locked on the first fastening chuck 34, and the first crucible carrying barrel 32 is first separated from the crucible 101, Then the first crucible carrying barrel 32 is lowered to the bottom plate 23 through the first lifting assembly 33, and then the first rotating support frame 302 is rotated through the first rotating cylinder 301, thereby driving the first crucible carrying barrel 32 Move along the first track 31 from the stirring area A2 to the preparation area A1.

At this time, the second crucible carrying barrel 42 located in the distillation area A3 rotates the first rotating support frame 302 through the first rotating cylinder 301, thereby driving the second crucible carrying barrel 42 to move along the second track 41. The distillation zone A3 moves to the stirring zone A2, and then the second crucible carrying barrel 42 is raised through the second lifting assembly 43, so that the crucible 101 falls into the second crucible carrying barrel 42. At this time, The crucible 101 is loosened from the first fastening chuck 34, and then the second crucible carrying barrel 42 is lowered through the second lifting assembly 43, and the second crucible carrying barrel 42 is moved along the second track. 41 moves from the stirring area A2 to the distillation area A3 (see Figure 2), then uses the second lifting assembly 43 to lift the second crucible carrying barrel 42, and locks the crucible with the second fastening chuck 44 Pot 101 (see Figure 4) for solvent distillation and recovery operations. After the solvent is removed, the crucible 101 is loosened from the second fastening chuck 44, and the second crucible carrying barrel 42 is lowered through the second lifting assembly 43. Finally, a person is lifted from the side of the machine 2 The discharging door 102 takes out the crucible 101.

As mentioned above, the double-rotor mixing device of the present invention uses the design of the inner rotor 35 and the outer rotor 37 to rotate in opposite directions. When the two maintain relative rotation speed and shearing effect, the high-viscosity coal tar pitch is driven to form a cross flow. field, and provides a wide range of silicon slurry disturbance and mixing, allowing high-viscosity asphalt and nano-silica clusters to be homogenized, while reducing equipment space, shortening the time required for the homogenization process, and improving the mixing of the slurry homogenization efficiency.

Although the present invention has been disclosed through embodiments, they are not intended to limit the present invention. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection of the present invention is The scope shall be determined by the appended patent application scope.

101: Crucible 102:Discharge door 2:Machine 21: base body 22:Fixed plate 23: Bottom plate 3: Stirring unit 31: First track 32: The first crucible carrying barrel 33:First lifting component 331:The first lifting rod 332: First pneumatic cylinder 34: First fastening chuck 341: First chuck pneumatic cylinder 35: Inner ring rotor 351: Inner ring drive belt 352: Inner ring shaft 353: Stirring tablet 36: Inner ring motor 37: Outer ring rotor 371: Outer ring drive belt 372: Outer ring shaft 373: Stirring grate 38: Outer ring motor 301: First rotating cylinder 302: First rotating support frame 4: Fractionation unit 41:Second track 42: Second crucible carrying barrel 43:Second lifting component 431:Second lifting rod 432: Second pneumatic cylinder 44:Second fastening chuck 441:Second chuck pneumatic cylinder 401: Second swing cylinder 402: Second rotating support frame A1: Preparatory area A2: Stirring area A3: Distillation area

Figure 1 is a schematic diagram of a dual-rotor stirring device operating in a state according to an embodiment of the present invention. Figure 2 is a schematic diagram of a dual-rotor stirring device operating in another state according to an embodiment of the present invention. Figure 3 is a perspective view of the first crucible carrying barrel of a dual-rotor stirring device according to an embodiment of the present invention. Figure 4 is a perspective view of the second crucible carrying barrel of a dual-rotor stirring device according to an embodiment of the present invention. Figure 5 is a schematic diagram of the inner rotor and the outer rotor of a dual-rotor stirring device according to an embodiment of the present invention.

35: Inner ring rotor

351: Inner ring drive belt

352: Inner ring shaft

353: Stirring tablet

36: Inner ring motor

37: Outer ring rotor

371: Outer ring drive belt

372: Outer ring shaft

373: Stirring grate

38: Outer ring motor

Claims (10)

A double-rotor mixing device includes: a machine platform, including a base body, a fixed plate and a bottom plate. The fixed plate and the base plate are arranged on the base body, and the base body has a preparation area, a mixing area and a Distillation zone, wherein the stirring zone is located between the preparation zone and the distillation zone; and a stirring unit is arranged on the machine platform, the stirring unit includes: a first track, which is arranged on the bottom plate and extends from the stirring zone Extending to the preparation area; a first crucible carrying barrel, used to carry a crucible and configured to move on the first track; a first lifting component disposed between the fixed plate and the bottom plate, the A lifting component is located in the stirring area and is configured to drive the first crucible carrying barrel to rise or fall; a first fastening chuck is provided on the fixed plate, and the first fastening chuck is located on the first crucible carrying barrel. above the barrel and configured to cover the first crucible carrying barrel and seal the crucible; an inner ring rotor passes through the first fastening chuck and extends into the crucible; an inner ring motor is arranged on The fixed plate, the inner ring motor is located in the stirring area and is configured to drive the inner ring rotor to rotate; an outer ring rotor is arranged on the periphery of the inner ring rotor; and an outer ring motor is arranged on the fixed plate, the outer ring rotor is The ring motor is located in the stirring area and is configured to drive the outer ring rotor to rotate; wherein the inner ring rotor and the outer ring rotor are configured to stir a slurry in the crucible, and the rotation of the inner ring rotor and the outer ring rotor In the opposite direction. The dual-rotor stirring device as claimed in claim 1, wherein the first lifting component It has a first lifting rod and a first pneumatic cylinder, and the first pneumatic cylinder is configured to drive the first lifting rod to telescope and drive the first crucible carrying barrel to rise or fall. The dual-rotor stirring device of claim 2, wherein the stirring unit further includes a first rotating cylinder and a first rotating support frame, the first rotating supporting frame is disposed on the top of the first crucible carrying barrel, the The first rotating cylinder is disposed at the bottom of the first lifting rod and is configured to rotate the first rotating support frame so that the first crucible carrying barrel moves from the stirring area to the preparation area along the first track. The double-rotor stirring device as claimed in claim 3, wherein the path of the first track is semicircular. The dual-rotor stirring device as claimed in claim 1, wherein the dual-rotor stirring device further includes a fractionation unit disposed on the machine platform, and the fractionation unit includes: a second track disposed on the bottom plate and from the distillation unit The zone extends to the stirring zone; a second crucible carrying barrel is used to carry the crucible and conduct heating fractionation of the crucible, and the second crucible carrying barrel is configured to move on the second track; a first Two lifting components are provided between the fixed plate and the bottom plate. The second lifting component is located in the distillation area and is configured to drive the second crucible carrying barrel to rise or fall; and a second fastening chuck is provided on The fixing plate and the second fastening chuck are located above the second crucible carrying barrel and are configured to cover the second crucible carrying barrel and seal the crucible. The dual-rotor stirring device of claim 5, wherein the second lifting component has a second lifting rod and a second pneumatic cylinder, and the second pneumatic cylinder is configured to drive the second lifting rod to expand and contract to drive the second The crucible carrying barrel is raised or lowered. The dual-rotor stirring device of claim 6, wherein the fractionation unit further includes a second rotating cylinder and a second rotating support frame, the second rotating supporting frame is disposed on the top of the second crucible carrying barrel, the The second swing cylinder is disposed at the bottom of the second lifting rod and is configured as The second rotating support frame is rotated so that the second crucible carrying barrel moves along the second track from the distillation zone to the stirring zone. The double-rotor stirring device as claimed in claim 7, wherein the path of the second track is semicircular. The double-rotor stirring device of claim 1, wherein the inner ring rotor has an inner ring drive belt, an inner ring rotating shaft and a stirring blade, and the inner ring drive belt is configured to be driven by the inner ring motor to drive the inner ring motor. The inner ring rotating shaft rotates, and the stirring blade is arranged at one end of the inner ring rotating shaft. The double-rotor stirring device of claim 9, wherein the outer-ring rotor has an outer-ring driving belt, an outer-ring rotating shaft and a stirring grid, and the outer-ring driving belt is configured to be driven by the outer ring motor. The outer ring rotating shaft rotates, and the stirring grille is arranged at one end of the outer ring rotating shaft.