Raw material mixing device for carbon fiber rope processing
By combining the main and auxiliary stirring mechanisms that rotate in opposite directions with the temperature control jacket, the problems of fiber damage, uneven mixing, and inaccurate temperature control in carbon fiber rope production are solved, achieving efficient and uniform mixing and convenient cleaning, thus improving product quality.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-03
- Publication Date
- 2026-03-13
AI Technical Summary
Existing carbon fiber rope production equipment is prone to fiber damage, uneven mixing, difficulty in cleaning, and inaccurate temperature control during the mixing process, resulting in a decline in product quality.
The main and auxiliary stirring mechanisms are rotated in opposite directions. Combined with flexible carding components and temperature control jackets, they form strong convection and shear flow fields, which reduce fiber damage and improve mixing uniformity. The flexible carding components scrape off the material adhering to the inner wall, and the temperature control jacket controls the temperature.
It effectively reduces fiber damage, improves mixing uniformity, facilitates cleaning, ensures that the resin is mixed at the optimal process temperature, and improves product quality.
Smart Images
Figure CN121648775A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of rope processing technology, specifically to a raw material mixing device for carbon fiber rope processing. Background Technology
[0002] Carbon fiber rope, as a high-performance reinforcing material, is widely used in aerospace, sporting goods, and building reinforcement. Its production process typically requires the thorough and uniform mixing of various raw materials, such as chopped carbon fibers, resin, curing agents, and toughening agents, to form a premix for subsequent impregnation or extrusion.
[0003] In existing technologies, equipment used for mixing carbon fiber raw materials mostly employs conventional mixers or kneaders. These devices have the following drawbacks in practical applications: (1) The high-speed rotating stirring blades can easily cause mechanical damage to brittle carbon fibers, break the fiber aspect ratio, and reduce the mechanical properties of the final product. At the same time, the fibers are very easy to get tangled on the stirring shaft, forming a "clumping" phenomenon, which leads to uneven mixing.
[0004] (2) There is a mixing dead zone between the inner wall of the conventional mixing container and the mixing blade. Viscous liquids such as resin tend to accumulate here, making it difficult to combine evenly with the fiber, resulting in inconsistent local composition of the mixture.
[0005] (3) After mixing, the viscous resin mixture is very easy to adhere to the inner wall of the container and the stirring parts. Cleaning is time-consuming and laborious, and it is easy to cause cross-contamination between different batches of materials.
[0006] (4) The viscosity of the resin is sensitive to temperature, and traditional equipment lacks an effective temperature control structure, making it difficult to maintain the optimal process temperature during mixing, which affects the rheology of the mixture and the quality of the final product. Summary of the Invention
[0007] To address the shortcomings of existing technologies, this invention provides a raw material mixing device for carbon fiber rope processing, which can effectively reduce damage to carbon fibers, prevent fiber entanglement, improve mixing uniformity, and facilitate cleaning and maintenance.
[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution: A raw material mixing device for carbon fiber rope processing includes a frame; a mixing cylinder having a top cover, a feed inlet, and a discharge outlet, the top cover being fastened to the mixing cylinder, the feed inlet being installed on the top cover, and the discharge outlet being located at the lower part of the mixing cylinder, the mixing cylinder having a cavity in its wall to form a temperature control jacket; a main stirring mechanism including a main stirring shaft rotatably connected to the central axis of the mixing cylinder, and a plurality of main stirring components detachably installed on the main stirring shaft, the main stirring component including a first sleeve and a plurality of main stirring blades fixed on the first sleeve; a secondary stirring mechanism including a secondary stirring shaft rotatably connected to the mixing cylinder, and a plurality of secondary stirring components sleeved on the secondary stirring shaft, the secondary stirring component including a second sleeve and a plurality of flexible combing elements fixed on the second sleeve; and a driving mechanism for driving the main stirring shaft and the secondary stirring shaft to rotate in opposite directions.
[0009] Preferably, the main stirring blade is a frame-type blade, the outer contour of which is adapted to the shape of the inner wall of the mixing cylinder, and a gap is left between the two.
[0010] Preferably, the auxiliary stirring mechanism is provided in two sets, symmetrically distributed on both sides of the main stirring mechanism.
[0011] Preferably, the outer wall of the main stirring shaft is provided with a first external spline along its height direction, the inner wall of the first sleeve is provided with a first internal spline that matches the first external spline, the first sleeve is splinedly connected to the main stirring shaft, the lower part of the main stirring shaft is fixedly connected with a first bearing plate for supporting the first sleeve, and the upper end of the main stirring shaft is threadedly connected with a first nut for pressing the first sleeve.
[0012] Preferably, the outer wall of the auxiliary stirring shaft is provided with a second external spline along its height direction, the inner wall of the second sleeve is provided with a second internal spline that matches the second external spline, the second sleeve is splinedly connected to the auxiliary stirring shaft, the lower part of the auxiliary stirring shaft is fixedly connected with a second bearing plate for supporting the second sleeve, and the upper end of the auxiliary stirring shaft is threadedly connected with a second nut for pressing the second sleeve.
[0013] Preferably, the flexible combing element is a plurality of flexible bristles or silicone rods arranged radially, with their ends fitting into the inner wall of the mixing cylinder.
[0014] Preferably, the temperature control jacket is provided with a medium inlet and a medium outlet communicating with its cavity.
[0015] Preferably, the inner wall of the mixing cylinder and the surface of the main stirring blades are coated with an anti-stick coating.
[0016] Preferably, the lower ends of both the main stirring shaft and the auxiliary stirring shaft are sealed and rotatably connected to the bottom surface of the mixing cylinder. The lower ends of the main stirring shaft and the auxiliary stirring shaft protrude from the bottom surface of the mixing cylinder and are connected to the drive mechanism. The drive mechanism includes a base, a reduction motor, a main gear, a secondary gear, a central gear, a first gear, a second gear, and a third gear. The reduction motor is mounted on the base, and the main gear is connected to the motor shaft of the reduction motor. The secondary gear and the central gear are both connected to the main stirring shaft, and the main gear meshes with the secondary gear. There are two of each of the first gear, the second gear, and the third gear, which are symmetrically distributed on both sides of the central gear. The first gear and the second gear are rotatably connected to the bottom surface of the mixing cylinder via a rotating shaft, and the third gear is connected to the auxiliary stirring shaft. The central gear, the first gear, the second gear, and the third gear mesh sequentially.
[0017] Preferably, the main stirring shaft is provided with an air supply channel, and the main stirring shaft has multiple first air holes communicating with the air supply channel. The first sleeve has multiple fan-shaped cavities, and the outer wall of the first sleeve has second air holes communicating with the cavities. The second air holes are located between adjacent main stirring blades, and the second air holes, the cavities, the first air holes, and the air supply channel are connected. A bracket is installed on the base, and an adapter is connected to the bracket. The main stirring shaft is rotatably connected to the adapter through a bearing. The adapter has an annular protrusion, and the lower end of the main stirring shaft has an annular groove. The annular protrusion is rotatably disposed in the annular groove. Multiple sets of sealing rings are provided at the contact point between the adapter and the main stirring shaft. An air pipe is connected to the adapter and is connected to a medium supply device.
[0018] Compared with the prior art, the present invention has the following beneficial effects: (1) By setting up main and auxiliary stirring mechanisms that rotate in opposite directions, a strong convection and shear flow field is formed in the mixing cylinder. The main stirring mechanism performs macroscopic large-scale mixing, while the flexible combing component of the auxiliary stirring mechanism can penetrate deep into the fiber clusters to break them up and comb them, effectively solving the problems of fiber "clumping" and mixing dead corners, and significantly improving the mixing uniformity.
[0019] (2) The auxiliary stirring mechanism uses flexible bristles or silicone rods, which are in flexible contact with carbon fiber, greatly reducing mechanical damage and cutting of carbon fiber, ensuring the integrity of the fiber and the strength of the final product.
[0020] (3) During the rotation process, the end of the flexible comb component always maintains a gap fit with the inner wall of the mixing drum, which is equivalent to a dynamic cleaning brush. It can effectively scrape off the sticky material attached to the inner wall, prevent material accumulation, and facilitate subsequent cleaning. When too much material accumulates on the main mixing component and the auxiliary mixing component, the top cover can be opened, the main mixing component and the auxiliary mixing component can be taken out, cleaned, and then reinstalled on the main mixing shaft and the auxiliary mixing shaft respectively. Cleaning is convenient.
[0021] (4) Hot water, hot oil or cooling medium can be introduced through the temperature control jacket set in the mixing cylinder wall. At the same time, the medium can also be introduced into the main stirring shaft to adjust the temperature of the mixture from the outside to the inside, ensuring that the resin is always at the optimal process viscosity and further guaranteeing the mixing quality. Attached Figure Description
[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional view of the present invention; Figure 3 Top sectional view of the main mixing mechanism; Figure 4 This is a top sectional view of the auxiliary stirring mechanism; Figure 5 Front sectional view of the main mixing mechanism; Figure 6 A schematic diagram of the gear set for the drive mechanism; In the diagram, 1-frame, 2-mixing cylinder, 21-top cover, 22-feed inlet, 23-discharge outlet, 24-temperature control jacket, 241-medium wellhead, 242-medium outlet, 3-main stirring mechanism, 31-main stirring shaft, 32-main stirring assembly, 321-first sleeve, 322-main stirring blade, 33-first bearing plate, 34-first nut, 4-secondary stirring mechanism, 41-secondary stirring shaft, 42-secondary stirring assembly, 421-secondary sleeve, 422-flexible combing component, 43-secondary bearing plate, 4 4-Second nut, 5-Drive mechanism, 51-Base, 52-Gear motor, 53-Main gear, 54-Second gear, 55-Center gear, 56-First gear, 57-Second gear, 58-Third gear, 6-Air supply channel, 7-First air hole, 8-Cavity, 9-Second air hole, 10-Bracket, 11-Adapter, 12-Bearing, 13-Annular protrusion, 14-Annular groove, 15-Sealing ring, 16-Air pipe, 17-Control valve, 18-Exhaust port, 19-Pressure gauge, 20-Thermometer. Detailed Implementation
[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0024] Example 1 Please see Figures 1-6 A raw material mixing device for carbon fiber rope processing includes a frame 1, a mixing cylinder 2, a main stirring mechanism 3, a secondary stirring mechanism 4, and a drive mechanism 5.
[0025] The mixing cylinder 2 is connected to the frame 1. The mixing cylinder is cylindrical and has a top cover 21, a feed inlet 22, and a discharge outlet 23. The top cover 21 is fastened to the mixing cylinder 2. Specifically, the top cover 21 can be threaded onto the mixing cylinder or bolted onto it. A sealing gasket is provided at the connection between the top cover 21 and the mixing cylinder to improve sealing.
[0026] The feed inlet 22 is installed on the top cover 21, and the discharge outlet 23 is located at the bottom of the mixing cylinder 2. Materials are added through the feed inlet and discharged through the discharge outlet. Control valves 17 (stop valves, gate valves, etc.) are installed on both the feed inlet and the discharge outlet to control their opening and closing.
[0027] The mixing cylinder 2 has a cavity inside its wall to form a temperature control jacket 24. The temperature control jacket 24 is provided with a medium inlet 241 and a medium outlet 242 communicating with its cavity, which can be used to introduce a circulating heat transfer medium to control the material temperature during the mixing process.
[0028] The main stirring mechanism 3 includes a main stirring shaft 31 rotatably connected to the central axis of the mixing cylinder 2, and multiple main stirring components 32 detachably mounted on the main stirring shaft 31. Each main stirring component 32 includes a first sleeve 321 and multiple main stirring blades 322 fixed to the first sleeve. In this embodiment, the main stirring blades 322 adopt a frame structure, with their outer contour matching the shape of the inner wall of the mixing cylinder 2 while maintaining a certain gap, to achieve a wide range of stirring while reducing hard impacts.
[0029] The outer wall of the main stirring shaft 31 is provided with a first external spline along its height direction, and the inner wall of the first sleeve 321 is provided with a first internal spline that matches the first external spline. The first sleeve 321 is splinedly connected to the main stirring shaft 31. A first bearing plate 33 for supporting the first sleeve is fixedly connected to the lower part of the main stirring shaft 31, and a first nut 34 for pressing the first sleeve is threadedly connected to the upper end of the main stirring shaft 31. When installing the main stirring assembly 32, multiple first sleeves 321 are splinedly connected to the main stirring shaft 31 one by one, with the lowest first sleeve 321 placed on the first bearing plate 33. The first nut 34 is threadedly connected to the main stirring shaft 31 and presses against the highest first sleeve 321, thus completing the installation of the main stirring assembly 32. Similarly, when cleaning is required, the top cover 21 is opened, the first nut 34 is unscrewed, and the first sleeves 321 are removed one by one.
[0030] Two sets of auxiliary stirring mechanisms 4 are symmetrically distributed on both sides of the main stirring mechanism 3. Each auxiliary stirring mechanism 4 includes an auxiliary stirring shaft 41 rotatably connected inside the mixing cylinder, and multiple auxiliary stirring components 42 sleeved on the auxiliary stirring shaft 41. Each auxiliary stirring component 42 includes a second sleeve 421 and multiple flexible combing elements 422 fixed to the second sleeve 421. These flexible combing elements 422 are preferably made of corrosion-resistant and wear-resistant nylon bristles or food-grade silicone, and their ends maintain a small gap (e.g., 1-3 mm) with the inner wall of the mixing cylinder 2.
[0031] The outer wall of the auxiliary stirring shaft 41 is provided with a second external spline along its height direction, and the inner wall of the second sleeve 421 is provided with a second internal spline that matches the second external spline. The second sleeve 421 is splinedly connected to the auxiliary stirring shaft 42. A second bearing plate 43 for supporting the second sleeve is fixedly connected to the lower part of the auxiliary stirring shaft 42, and a second nut 44 for pressing the second sleeve is threadedly connected to the upper end of the auxiliary stirring shaft 42. When installing the auxiliary stirring assembly 42, multiple second sleeves 421 are splinedly connected to the auxiliary stirring shaft 41 one by one, with the lowest second sleeve 421 placed on the second bearing plate 43. The second nut 44 is threadedly connected to the auxiliary stirring shaft 41 and presses against the highest second sleeve 421, thus completing the installation of the auxiliary stirring assembly 42. Similarly, when cleaning is required, the top cover 21 is opened, the second nut 44 is unscrewed, and the second sleeves 421 are removed one by one.
[0032] The drive mechanism 5 is used to drive the main stirring shaft 31 and the auxiliary stirring shaft 41 to rotate in opposite directions.
[0033] The lower ends of both the main stirring shaft 31 and the auxiliary stirring shaft 41 are sealed and rotatably connected to the bottom surface of the mixing cylinder 2. The lower ends of the main stirring shaft 31 and the auxiliary stirring shaft 41 protrude from the bottom surface of the mixing cylinder 2 and are connected to the drive mechanism 5. The drive mechanism 5 includes a base 51, a reduction motor 52, a main gear 53, an auxiliary gear 54, a center gear 55, a first gear 56, a second gear 57, and a third gear 58. The reduction motor 52 is mounted on the base 51, and a [missing information - likely a gear or component] is connected to the motor shaft of the reduction motor 52. The main gear 53, auxiliary gear 54, and central gear 55 are all connected to the main stirring shaft 31, with the main gear 53 meshing with the auxiliary gear 54. There are two first gears 56, two second gears 57, and three third gears 58, symmetrically distributed on both sides of the central gear 55. The first gear 56 and second gear 57 are rotatably connected to the bottom surface of the mixing cylinder 2 via rotating shafts, and the third gear 58 is connected to the auxiliary stirring shaft 41. The central gear 55, first gear 56, second gear 57, and third gear 58 mesh sequentially. When the reduction motor 52 is started, the main stirring shaft 31 rotates through the engagement of the main gear 53 and auxiliary gear 54. The main stirring shaft 31 then rotates the central gear 55, which in turn rotates the auxiliary stirring shaft 41 through the engagement of the first gear 56, second gear 57, and third gear 58. This achieves opposite rotation of the main and auxiliary stirring shafts, creating a relative shearing field between the main and auxiliary stirring mechanisms.
[0034] In addition, the inner wall of the mixing drum 2 and the surface of the main stirring blade 322 are coated with an anti-stick coating to reduce material adhesion.
[0035] The raw material mixing device described in this embodiment also includes a temperature gauge 20 and a pressure gauge 19 for sensing the temperature and pressure inside the mixing cylinder.
[0036] The working principle of this embodiment is as follows: During operation, various raw materials are first fed into the mixing drum 2 through the feed inlet 22. The drive mechanism 5 is activated, and the main stirring mechanism 3 and the auxiliary stirring mechanism 4 begin to rotate in opposite directions. The main stirring blades 322 propel the materials through a large-scale macroscopic circulation mixing process. Simultaneously, the high-speed rotating flexible carding element 422 inserts itself into the fiber clumps like a comb, gently breaking them up and combing them to prevent tangling. During rotation, the flexible carding element also continuously "cleans" the inner wall of the mixing drum 2 to prevent resin adhesion. A medium of suitable temperature is introduced through the temperature control jacket 24 to control the mixing temperature. After mixing is complete, stirring is stopped, and the control valve on the discharge port 23 is opened to discharge the material.
[0037] Example 2 The main stirring shaft 31 is provided with an air supply channel 6. The main stirring shaft 31 has multiple first air holes 7 that communicate with the air supply channel 6. The first sleeve 321 has multiple fan-shaped cavities 8. The outer wall of the first sleeve 321 has second air holes 9 that communicate with the cavities 8. The second air holes 9 are located between adjacent main stirring blades 322. The second air holes 9, cavities 8, first air holes 7, and air supply channel 6 are connected. A bracket 10 is installed on the base 51. An adapter 11 is connected to the bracket 10. The main stirring shaft 31 is rotatably connected to the adapter 11 through a bearing 12. The adapter 11 has an annular protrusion 13. The lower end of the main stirring shaft 31 has an annular groove 14. The annular protrusion 13 is rotatably set in the annular groove 14. Multiple sets of sealing rings 15 are provided at the contact point between the adapter 11 and the main stirring shaft. An air pipe 16 is connected to the adapter 11. The air pipe 16 is connected to a medium supply device. The medium here can be hot air. The top cover is provided with an exhaust port, and a control valve is also installed on the exhaust port.
[0038] Hot air enters the main stirring shaft 31 through the air pipe 16, enters the cavity 8 through the first air hole 7, and then exits through the second air hole 9, thus delivering hot air from the center of the material. Combined with the heating medium in the temperature control jacket 24, the temperature of the mixture is adjusted from the outside to the inside, ensuring that the resin is always at the optimal process viscosity, further guaranteeing the mixing quality.
[0039] It should be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0040] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.
Claims
1. A raw material mixing device for carbon fiber rope processing, characterized in that: include Rack (1); The mixing cylinder (2) has a top cover (21), a feed inlet (22) and a discharge outlet (23). The top cover (21) is fastened to the mixing cylinder (2), the feed inlet (22) is installed on the top cover (21), and the discharge outlet (23) is located at the lower part of the mixing cylinder (2). The mixing cylinder (2) has a cavity in its inner wall to form a temperature control jacket (24). The main stirring mechanism (3) includes a main stirring shaft (31) rotatably connected to the central axis of the mixing cylinder (2), and a plurality of main stirring components (32) detachably mounted on the main stirring shaft (31). The main stirring components (32) include a first sleeve (321) and a plurality of main stirring blades (322) fixed on the first sleeve. The auxiliary stirring mechanism (4) includes an auxiliary stirring shaft (41) rotatably connected to the mixing cylinder, and a plurality of auxiliary stirring components (42) sleeved on the auxiliary stirring shaft (41). The auxiliary stirring components (42) include a second sleeve (421) and a plurality of flexible combing parts (422) fixed on the second sleeve (421). A drive mechanism (5) is used to drive the main stirring shaft (31) and the auxiliary stirring shaft (41) to rotate in opposite directions.
2. The raw material mixing device for carbon fiber rope processing according to claim 1, characterized in that: The main stirring blade (322) is a frame blade, the outer contour of which is adapted to the shape of the inner wall of the mixing cylinder (2), and there is a gap between them.
3. The raw material mixing device for carbon fiber rope processing according to claim 2, characterized in that: The auxiliary stirring mechanism (4) is provided in two sets, symmetrically distributed on both sides of the main stirring mechanism (3).
4. The raw material mixing device for carbon fiber rope processing according to claim 3, characterized in that: The outer wall of the main stirring shaft (31) is provided with a first external spline along its height direction, and the inner wall of the first sleeve (321) is provided with a first internal spline that matches the first external spline. The first sleeve (321) is splinedly connected to the main stirring shaft (31). The lower part of the main stirring shaft (31) is fixedly connected with a first bearing plate (33) for supporting the first sleeve, and the upper end of the main stirring shaft (31) is threadedly connected with a first nut (34) that presses the first sleeve.
5. The raw material mixing device for carbon fiber rope processing according to claim 4, characterized in that: The outer wall of the auxiliary stirring shaft (41) is provided with a second external spline along its height direction, and the inner wall of the second sleeve (421) is provided with a second internal spline that matches the second external spline. The second sleeve (421) is splinedly connected to the auxiliary stirring shaft (42). The lower part of the auxiliary stirring shaft (42) is fixedly connected to a second bearing plate (43) for supporting the second sleeve, and the upper end of the auxiliary stirring shaft (42) is threadedly connected to a second nut (44) that presses the second sleeve.
6. The raw material mixing device for carbon fiber rope processing according to claim 5, characterized in that: The flexible combing component (422) consists of multiple flexible bristles or silicone rods arranged radially, with their ends fitting into the inner wall of the mixing cylinder (2).
7. The raw material mixing device for carbon fiber rope processing according to claim 6, characterized in that: The temperature control jacket (24) is provided with a medium inlet (241) and a medium outlet (242) communicating with its cavity.
8. The raw material mixing device for carbon fiber rope processing according to claim 7, characterized in that: The inner wall of the mixing cylinder (2) and the surface of the main stirring blade (322) are coated with an anti-stick coating.
9. The raw material mixing device for carbon fiber rope processing according to claim 8, characterized in that: The lower ends of the main stirring shaft (31) and the auxiliary stirring shaft (41) are sealed and rotatably connected to the bottom surface of the mixing cylinder (2). The lower ends of the main stirring shaft (31) and the auxiliary stirring shaft (41) protrude from the bottom surface of the mixing cylinder (2), and the protruding ends are connected to the drive mechanism (5) for transmission. The drive mechanism (5) includes a base (51), a reduction motor (52), a main gear (53), an auxiliary gear (54), a center gear (55), a first gear (56), a second gear (57), and a third gear (58). The reduction motor (52) is mounted on the base (51), and the main gear (58) is connected to the motor shaft of the reduction motor (52). 3) The auxiliary gear (54) and the central gear (55) are both connected to the main stirring shaft (31), and the main gear (53) meshes with the auxiliary gear (54); there are two of each of the first gear (56), the second gear (57) and the third gear (58), and they are symmetrically distributed on both sides of the central gear (55); the first gear (56) and the second gear (57) are rotatably connected to the bottom surface of the mixing cylinder (2) through a rotating shaft, and the third gear (58) is connected to the auxiliary stirring shaft (41). The central gear (55), the first gear (56), the second gear (57) and the third gear (58) mesh in sequence.
10. The raw material mixing device for carbon fiber rope processing according to claim 1, characterized in that: The main stirring shaft (31) is provided with an air supply channel (6), and the main stirring shaft (31) is provided with a plurality of first air holes (7) communicating with the air supply channel (6). The first sleeve (321) is provided with a plurality of fan-shaped cavities (8), and the outer wall of the first sleeve (321) is provided with a second air hole (9) communicating with the cavity (8). The second air hole (9) is located between adjacent main stirring blades (322), and the second air hole (9), the cavity (8), the first air hole (7), and the air supply channel (6) are connected. A bracket is installed on the base (51). (10) A connector (11) is connected to the bracket (10). The main stirring shaft (31) is rotatably connected to the connector (11) through a bearing (12). An annular protrusion (13) is provided in the connector (11). An annular groove (14) is provided at the lower end of the main stirring shaft (31). The annular protrusion (13) is rotatably set in the annular groove (14). Multiple sets of sealing rings (15) are provided at the contact point between the connector (11) and the main stirring shaft. An air pipe (16) is connected to the connector (11). The air pipe (16) is connected to the medium supply equipment.