Mineral vitamin emulsifying equipment

Abstract

The invention belongs to the technical field of emulsifying equipment, and particularly relates to mineral vitamin emulsifying equipment. Comprising a tank body and a cover body, an emulsifying assembly is arranged on the inner side of the cover body, a motor is arranged on the cover body, the emulsifying assembly comprises a lifting sleeve and an emulsifying head, a lifting mechanism is arranged in the lifting sleeve, the motor is in transmission connection with the lifting mechanism, and the emulsifying head slidably sleeves the lifting sleeve and is in transmission connection with the lifting mechanism. A plurality of paddles are arranged on the side face of the emulsifying head, the paddles rotate on the two sides of a liquid-gas interface to form lift force changes, the lifting mechanism has the descending trend effect on the emulsifying head to drive the emulsifying head to ascend and descend in a reciprocating mode, the lifting mechanism further comprises a transmission shaft, an inner ring gear and an outer ring gear, and the transmission shaft is in transmission connection with the motor. The outer ring gear is arranged between the inner ring gear and the inner wall of the emulsifying head; the outer ring gear is respectively meshed with the inner ring gear and the inner wall of the emulsifying head; according to the invention, complete emulsification of vitamins during low-speed rotation can be realized.

Description

Technical Field

[0001] This invention belongs to the field of emulsification equipment technology, specifically relating to a mineral and vitamin emulsification device. Background Technology

[0002] The core of vitamin emulsification technology lies in solving the dispersion problem of fat-soluble vitamins in aqueous systems, aiming to improve their bioavailability and product stability. Because these vitamins are hydrophobic and cannot dissolve directly in water, they will precipitate as oil droplets without treatment, leading to product stratification, quality deterioration, and poor absorption by the human body. Emulsification technology utilizes the amphiphilic properties of emulsifiers to form a protective film at the oil-water interface. With the help of the enormous energy input from external mechanical equipment, the vitamin oil phase is broken into extremely small droplets (typically micrometers or nanometers in size) and uniformly and stably dispersed in the aqueous phase, forming a thermodynamically unstable but kinetically stable emulsion. To achieve this process, efficient emulsification equipment is crucial. Its development has evolved from early simple stirred tanks and high-shear dispersers to the current high-pressure homogenizer. This homogenizer forces the mixture through a narrow homogenizing valve gap under extremely high pressure, generating intense shearing, cavitation, and impact forces, thereby obtaining an emulsion with fine and uniform particle size distribution.

[0003] Because the emulsifying head is typically installed only at the end of the stirring shaft (near the bottom of the vessel), when processing oil-water two-phase systems, the less dense oil phase tends to float on the surface, forming an "oil cap." The strong vortex and high-shear zone generated by the high-speed rotating emulsifying head at the bottom only act on the lower part of the liquid, failing to effectively entrain the top oil phase into the shear zone. Due to gravity, interfacial tension hindering wetting, and the lack of forced vertical convection, the oil phase remains in a low-velocity, low-shear "dead zone," preventing it from being fully broken down and dispersed. Even if some oil droplets accidentally fall into the water, they quickly coalesce and float to the surface because they do not promptly enter the high-shear core zone. Ultimately, although the emulsification process appears complete, a large number of unemulsified, large-sized oil droplets remain in the system. After settling, severe stratification inevitably occurs, affecting product uniformity, stability, and quality pass rate.

[0004] To achieve better emulsification in this situation, a higher rotation speed is required, which necessitates increased drive power. The rotation of the equipment and the high-speed agitation of the liquid cause the liquid temperature to rise, and high temperatures can easily deactivate vitamins. Therefore, to avoid the problem of incomplete emulsification of minerals and vitamins due to low-speed rotation, a mineral and vitamin emulsification device has been proposed. Summary of the Invention

[0005] To address the aforementioned problems in the prior art, this invention provides a mineral and vitamin emulsification device.

[0006] The objective of this invention can be achieved through the following technical solutions: This invention discloses a mineral and vitamin emulsification device, comprising a tank and a lid. An emulsification component is disposed inside the lid, and a motor is disposed on the lid. The emulsification component includes a lifting sleeve and an emulsification head. A lifting mechanism is disposed inside the lifting sleeve, and the motor is drivenly connected to the lifting mechanism. The emulsification head is slidably sleeved on the lifting sleeve and drivenly connected to the lifting mechanism. Several blades are disposed on the side of the emulsification head. The blades rotate on both sides of the liquid-gas interface to generate lift changes, and the lifting mechanism creates a downward trend on the emulsification head, driving the emulsification head to reciprocate up and down.

[0007] As a further embodiment of the present invention, the lifting mechanism includes a return spring, the two ends of which are respectively connected to the bottom of the lifting sleeve and the emulsifying head.

[0008] As a further embodiment of the present invention, the side wall of the lifting sleeve is provided with a through groove, and the lifting mechanism is connected to the emulsifying head through the through groove.

[0009] As a further embodiment of the present invention, the lifting mechanism further includes a transmission shaft, an inner ring gear, and an outer ring gear. The transmission shaft is connected to the motor, the inner ring gear is connected to the transmission shaft, and the outer ring gear is disposed between the inner ring gear and the inner wall of the emulsifying head. The outer ring gear meshes with the inner ring gear and the inner wall of the emulsifying head respectively.

[0010] As a further embodiment of the present invention, the lifting mechanism further includes an upper sliding plate and a lower sliding plate, the upper sliding plate and the lower sliding plate being rotatably fitted into the upper and lower ends of the inner ring gear, and the upper and lower ends of the inner ring gear being rotatably disposed on the upper sliding plate and the lower sliding plate, respectively.

[0011] As a further embodiment of the present invention, the upper sliding plate and the lower sliding plate extend out of the through groove, and the upper sliding plate and the lower sliding plate respectively abut against and limit the top and bottom of the through groove.

[0012] As a further embodiment of the present invention, the transmission shaft is provided with an arc-shaped keyway, and a spherical key is rotatably provided on the inner side of the inner ring gear, the spherical key being rolled within the arc-shaped keyway.

[0013] As a further embodiment of the present invention, the lifting mechanism further includes a buffer spring, the two ends of which are respectively connected to the top of the lifting sleeve and the top of the emulsifying head.

[0014] As a further embodiment of the present invention, a stirring rod is rotatably embedded in the cover, and the top of the stirring rod is connected to the drive shaft.

[0015] As a further embodiment of the present invention, the cover is provided with an annular groove, the outer ring sidewall of the annular groove is provided with teeth, the top of the stirring rod is provided with a transmission gear, the transmission gear meshes with the outer ring sidewall and the transmission shaft respectively, and the transmission shaft and the stirring rod rotate synchronously and revolve.

[0016] The beneficial effects of this invention are as follows: (1) By changing the emulsifying head from a fixed position to a liftable type, the emulsifying head needs to be simultaneously raised and lowered during the emulsification process, in addition to rotating. Specifically, the blades installed on the outer wall of the emulsifying head generate a certain lift force as the emulsifying head rotates. As the emulsifying head rotates, the lift force generated by the blades drives the emulsifying head to rise along the lifting sleeve. The lifting mechanism, on the one hand, drives the emulsifying head to rotate, and on the other hand, provides a certain downward force to the emulsifying head, causing the emulsifying head to tend to move downward. Since the blades are at the top of the emulsifying head, the lift force they generate will overcome the downward force of the lifting mechanism and rise. Therefore, as the emulsifying head rises, the blades will be the first to emerge from the liquid surface and contact the gas inside the tank. At the same time, the lift force decreases, and the emulsifying head will fall again under the downward force of the lifting mechanism after losing lift force. As the blades sink back into the liquid and regain lift force, the emulsifying head rises again. The change in lift force generated by the blades switching at the liquid-gas interface can drive the raising and lowering of the emulsifying head.

[0017] (2) The revolution of the stirring rod, similar to the principle of planetary motion, drives the entire material system to circulate over a wide range, forcing the material in the corners of the tank to be continuously scraped up and carried into the main flow, completely solving the problems of wall adhesion and bottom sedimentation. The rotation of each stirring rod creates local, strong shear zones and small circulations in its vicinity. This is equivalent to setting multiple auxiliary emulsification points in the tank, pre-shearing and pre-mixing the material. The central emulsification head is the main high-energy input point. The raising and lowering of the emulsification head ensures that the material in all vertical layers from the liquid surface to the tank can be directly subjected to extremely high shear force. The flow field generated by the revolution and rotation of the stirring rod continuously transports all the material in the tank to the range of action of the moving emulsification head, which then instantly crushes and emulsifies it. The planetary stirring system is responsible for grabbing, conveying and initial emulsification, while the emulsification head is responsible for re-emulsification, and the two continuously circulate. Attached Figure Description

[0018] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of the emulsifying head of the present invention when it is raised; Figure 2 This is a schematic diagram of the overall structure of the emulsifying head of the present invention during descent; Figure 3This is a schematic diagram of the internal structure of the emulsification component of the present invention; Explanation of reference numerals in the attached drawings: 1. Tank body; 2. Cover body; 3. Motor; 4. Lifting sleeve; 5. Through groove; 6. Emulsifying head; 7. Paddle blade; 8. Upper sliding plate; 9. Lower sliding plate; 10. Drive shaft; 11. Drive gear; 12. Stirring rod; 13. Return spring; 14. Buffer spring; 15. Spherical key; 16. Arc-shaped keyway. Detailed Implementation

[0020] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0021] like Figures 1-3 As shown, a mineral vitamin emulsification device of the present invention includes a tank 1 and a cover 2. An emulsification component is provided inside the cover 2, and a motor 3 is provided on the cover 2. The emulsification component includes a lifting sleeve 4 and an emulsification head 6. A lifting mechanism is provided inside the lifting sleeve 4. The motor 3 is drivenly connected to the lifting mechanism. The emulsification head 6 is slidably sleeved on the lifting sleeve 4 and drivenly connected to the lifting mechanism. Several blades 7 are provided on the side of the emulsification head 6. The blades 7 rotate on both sides of the liquid-gas interface to form a change in lift force, and the lifting mechanism creates a downward trend on the emulsification head 6, driving the emulsification head 6 to reciprocate up and down.

[0022] Since the emulsifying head 6 is typically only installed at the end of the stirring shaft, when processing oil-water two-phase systems, the less dense oil phase tends to float on the surface, forming an "oil cap." The strong vortex and high-shear zone generated by the high-speed rotating emulsifying head 6 at the bottom only act on the lower part of the liquid, failing to effectively entrain the top oil phase into the shear zone. Due to gravity, interfacial tension hindering wetting, and the lack of forced vertical convection, the oil phase remains in a low-velocity, low-shear "dead zone," preventing it from being fully broken down and dispersed. Even if some oil droplets accidentally fall into the water, they quickly coalesce and float to the surface because they do not enter the high-shear core zone in time. Ultimately, although the emulsification process appears complete, a large number of unemulsified, large-sized oil droplets remain in the system. After settling, severe stratification inevitably occurs, affecting product uniformity, stability, and quality pass rate. In this situation, to achieve better emulsification, the rotation speed needs to be increased, which requires increasing the drive power. The rotation of the equipment and the high-speed stirring of the liquid will cause the liquid temperature to rise, and high temperatures can easily deactivate vitamins.

[0023] To avoid the aforementioned problems, in this embodiment, the emulsifying head 6 is changed from a fixed position to a liftable type, so that in addition to rotation, the emulsifying head 6 also needs to be raised and lowered synchronously during the emulsification process. Specifically, the blades 7 provided on the outer wall of the emulsifying head 6 generate a certain lift force as the emulsifying head 6 rotates. As the emulsifying head 6 rotates, the lift force generated by the blades 7 drives the emulsifying head 6 to rise along the lifting sleeve 4. The lifting mechanism, on the one hand, drives the emulsifying head 6 to rotate, and on the other hand, provides a certain downward force to the emulsifying head 6, causing the emulsifying head 6 to tend to move downward. Since the blades 7 are at the top of the emulsifying head 6, the lift force they generate will overcome the downward force of the lifting mechanism and rise. Therefore, as the emulsifying head 6 rises, the blades 7 will first emerge from the liquid surface and come into contact with the gas inside the tank 1. At the same time, the lift force decreases, and the emulsifying head 6 will fall again under the downward force of the lifting mechanism after losing lift force. As the blades 7 sink back into the liquid and regain lift force, the emulsifying head 6 rises again. The change in lift generated by the switching of the blades 7 at the liquid-gas interface can drive the emulsification head 6 to rise and fall. The liquid-gas interface is the interface between the liquid and the gas in the tank 1.

[0024] During the up-and-down movement of the emulsifying head 6, it actively moves upward to sweep the oil-water interface while rotating, forcibly capturing the floating oil film; during descent, it sprays the emulsion downward, driving the longitudinal circulating flow field inside the tank 1; dynamically covering the entire liquid level height, achieving shearing without dead angles from the liquid surface to the bottom of the vessel. During the ascent, it transports the lower liquid flow upward; when it reaches the top, the vortex it generates can directly act on and tear apart the uppermost oil phase or light phase layer, forcibly dragging it into the main liquid flow. This ensures that all areas from the bottom of the tank to the liquid surface are fully disturbed, without any dead angles or stagnant stratification zones. This allows the oil and water phases to achieve preliminary, large-scale premixing before entering the high-shear zone, eliminating the need for oil droplets at the top of the stagnant zone to be accidentally sucked into the bottom. They pass through the high-shear zone of the emulsifying head 6 multiple times during the ascent and descent. Each passage breaks them into smaller particles. This repeated processing results in a more uniform particle size distribution of the material, avoiding over-processing in some areas and under-processing in others, thus producing a more stable and higher-quality emulsion. Simultaneously, the rotational shear energy is evenly distributed throughout the tank 1 as the emulsifying head 6 rises and falls, preventing localized heat accumulation and facilitating temperature control, making it particularly suitable for heat-sensitive materials. The liftable emulsifying head 6 achieves full-area mixing with relatively low energy input, eliminating the need to excessively increase the rotation speed to accommodate the upper layer, thus saving energy and preventing vitamin deactivation.

[0025] As a further embodiment of the present invention, the lifting mechanism includes a return spring 13, with its two ends connected to the bottom of the lifting sleeve 4 and the emulsifying head 6, respectively. The return spring 13 provides a certain downward pulling force to the emulsifying head 6, causing the blades 7 on the emulsifying head 6 to protrude from the liquid surface, reducing the lift and pulling the emulsifying head 6 back down to the bottom.

[0026] Since the lifting mechanism is located inside the lifting sleeve 4, and the emulsifying head 6 needs to move up and down along the lifting sleeve 4, in order to enable the lifting mechanism to drive the emulsifying head 6 while also allowing the emulsifying head 6 to move along the lifting sleeve 4, in one embodiment, a through groove 5 is provided on the side wall of the lifting sleeve 4. The lifting mechanism is connected to the emulsifying head 6 through the through groove 5. Specifically, the through groove 5 is arranged along the axial direction of the lifting sleeve 4, and the length of the through groove 5 is used to limit the upper and lower limits of the emulsifying head 6's movement.

[0027] Specifically, the lifting mechanism also includes a drive shaft 10, an inner ring gear, and an outer ring gear. The drive shaft 10 is connected to the motor 3. The inner ring gear is connected to the drive shaft 10, and the outer ring gear is located between the inner ring gear and the inner wall of the emulsifying head 6. The outer ring gear meshes with both the inner ring gear and the inner wall of the emulsifying head 6. The inner ring gear can slide and move up and down within the lifting sleeve 4. The inner wall of the emulsifying head 6 has teeth that can mesh with the outer ring gear. After the drive shaft 10 is connected to the inner ring gear, the inner ring gear drives the outer ring gear to rotate, and then the outer ring gear drives the rotation of the emulsifying head 6.

[0028] In the above embodiments, the outer ring gear is positioned between the inner ring gear and the emulsifying head 6. To ensure stable transmission of the outer ring gear, in one embodiment, the lifting mechanism further includes an upper sliding plate 8 and a lower sliding plate 9. The upper and lower sliding plates 8 and 9 are rotatably fitted onto the upper and lower ends of the inner ring gear, respectively. The upper and lower ends of the inner ring gear are rotatably mounted on the upper and lower sliding plates 8 and 9, respectively. The rotational engagement of the upper and lower sliding plates 8 and 9 with the inner ring gear means that the upper and lower sliding plates 8 and 9 are coaxially rotatably connected to the inner ring gear. A through hole is formed in the center of the upper and lower sliding plates 8 and 9 for the transmission shaft 10 to pass through, and the upper and lower sliding plates 8 and 9 can also rotate relative to the transmission shaft 10. Simultaneously, since the inner ring gear is connected to the emulsifying head 6 via the outer ring gear at the through slot 5, the upper and lower sliding plates 8 and 9 are limited and cannot rotate relative to the lifting sleeve 4. In this case, the upper and lower sliding plates 8 and 9 do not affect the free rotation and lifting of the inner and outer ring gears.

[0029] As a further embodiment of the present invention, the upper sliding plate 8 and the lower sliding plate 9 extend beyond the through groove 5, and the upper sliding plate 8 and the lower sliding plate 9 respectively abut and limit the movement of the top and bottom of the through groove 5. The centers of the upper sliding plate 8 and the lower sliding plate 9 are circular, and the edges extend outward from the position of the through groove 5 to form support legs. This structure, on the one hand, extends beyond the through groove 5 to limit the movement of the upper sliding plate 8 and the lower sliding plate 9, preventing them from rotating; on the other hand, it allows the outer ring gear to be rotatably mounted on the extended support legs, and the extended support legs can also be used to limit the upper and lower positions of the emulsifying head 6.

[0030] As a further embodiment of the present invention, an arc-shaped keyway 16 is provided on the drive shaft 10, and a spherical key 15 is rotatably provided on the inner side of the inner ring gear, with the spherical key 15 rolling within the arc-shaped keyway 16. Since the emulsifying head 6 needs to move up and down along the lifting sleeve 4 during rotation, the lifting mechanism also needs to move up and down synchronously with the emulsifying head 6. If the inner ring gear and the drive shaft 10 are connected by a common key, the relative position change between the inner ring gear and the drive shaft 10 cannot be achieved due to the large frictional force. Therefore, by changing the original common key connection to a spherical key 15 connection, a hemispherical groove is provided on the inner wall of the inner ring gear, allowing the spherical key 15 to rotate within the hemispherical groove. An axial arc-shaped keyway 16 is provided on the side of the drive shaft 10 for the spherical key 15 to roll within the arc-shaped keyway 16. Through the connection and cooperation of the spherical key 15 and the arc-shaped keyway 16, the drive shaft 10 and the inner ring gear can be used for transmission on one hand, and the relative frictional force between them can be reduced on the other hand, allowing the inner ring gear to slide along the drive shaft 10.

[0031] As a further embodiment of the present invention, the lifting mechanism also includes a buffer spring 14, with its two ends connected to the top of the lifting sleeve 4 and the top of the emulsifying head 6, respectively. In the above embodiment, a return spring 13 is provided at the bottom of the emulsifying head 6. After the blade 7 at the top of the emulsifying head 6 emerges from the liquid surface, the lift decreases, and the emulsifying head 6 is instantly pulled back to the bottom by the return spring 13. To prevent the emulsifying head 6 from bumping due to the bottom limit when the return spring 13 pulls it back to the bottom, thus causing vibration during continuous reciprocating motion, a buffer spring 14 is provided at the top. The elastic force of the buffer spring 14 is smaller than that of the return spring 13, and it only generates a certain elastic force when the emulsifying head 6 descends to the bottom, preventing the emulsifying head 6 from moving too quickly to the bottom.

[0032] As a further embodiment of the present invention, a stirring rod 12 is rotatably embedded in the cover 2, and the top of the stirring rod 12 is connected to the drive shaft 10. An annular groove is provided on the cover 2, and teeth are provided on the outer side wall of the annular groove. A drive gear 11 is provided on the top of the stirring rod 12, and the drive gear 11 meshes with the outer side wall and the drive shaft 10 respectively. The drive shaft 10 and the stirring rod 12 rotate synchronously and revolve.

[0033] The revolution of the stirring rod 12, similar to the principle of planetary motion, drives the entire material system to circulate over a wide area, forcing the material in the corners of the tank 1 to be continuously scraped up and carried into the main flow, completely solving the problems of wall adhesion and bottom sedimentation. The rotation of each stirring rod 12 creates localized, strong shear zones and small circulations in its vicinity. This is equivalent to setting multiple auxiliary emulsification points in the tank 1, pre-shearing and pre-mixing the material. The central emulsifying head 6 is the main high-energy input point. The raising and lowering of the emulsifying head 6 ensures that the material at all vertical levels from the liquid surface to the tank 1 can be directly subjected to extremely high shear forces. The flow field generated by the revolution and rotation of the stirring rod 12 continuously transports all the material in the tank 1 to the range of action of the moving emulsifying head 6, which then instantly pulverizes and emulsifies it. The planetary stirring system is responsible for grabbing, conveying, and initial emulsification, while the emulsifying head 6 is responsible for secondary emulsification; both operate in a continuous cycle.

[0034] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A mineral vitamin emulsification apparatus characterized by: The application relates to a milk emulsification device, which comprises a tank body and a cover body, the cover body is internally provided with an emulsification assembly, the cover body is provided with a motor, the emulsification assembly comprises a lifting sleeve and an emulsification head, the lifting sleeve is internally provided with a lifting mechanism, the motor is in transmission connection with the lifting mechanism, the emulsification head is slidably sleeved on the lifting sleeve and in transmission connection with the lifting mechanism, the emulsification head is provided with a plurality of paddles on the side surface, the paddles rotate on both sides of a liquid-gas interface to form lift change, and the lifting mechanism drives the emulsification head to reciprocatingly ascend and descend.

2. A mineral vitamin emulsification apparatus according to claim 1, characterized in that: The lifting mechanism comprises a reset spring, and the two ends of the reset spring are connected to the bottom of the lifting sleeve and the emulsification head respectively.

3. A mineral vitamin emulsification apparatus according to claim 1, characterized in that: A through groove is formed in the side wall of the lifting sleeve, and the lifting mechanism is in transmission connection with the emulsification head through the through groove.

4. A mineral vitamin emulsification apparatus according to claim 1, characterized in that: The lifting mechanism further comprises a transmission shaft, an inner ring gear and an outer ring gear, the transmission shaft is in transmission connection with the motor, the inner ring gear is connected to the transmission shaft, the outer ring gear is arranged between the inner ring gear and the inner wall of the emulsification head, and the outer ring gear is in meshing connection with the inner ring gear and the inner wall of the emulsification head respectively.

5. A mineral vitamin emulsification apparatus according to claim 4, characterized in that: The lifting mechanism further comprises an upper sliding plate and a lower sliding plate, the upper sliding plate and the lower sliding plate are rotatably embedded in the upper and lower ends of the inner ring gear respectively, and the upper and lower ends of the inner ring gear are rotatably arranged on the upper sliding plate and the lower sliding plate respectively.

6. A mineral vitamin emulsification apparatus according to claim 5, characterized in that: The upper sliding plate and the lower sliding plate extend out of the through groove, and the upper sliding plate and the lower sliding plate are in abutting limiting connection with the top and the bottom of the through groove respectively.

7. A mineral vitamin emulsification apparatus according to claim 4, characterized in that: An arc-shaped key groove is formed in the transmission shaft, a spherical key is rotatably arranged in the inner side of the inner ring gear, and the spherical key is rollingly arranged in the arc-shaped key groove.

8. A mineral vitamin emulsification apparatus according to claim 1, characterized in that: The lifting mechanism further comprises a buffer spring, and the two ends of the buffer spring are connected to the top of the lifting sleeve and the top of the emulsification head respectively.

9. A mineral vitamin emulsification apparatus according to claim 1, characterized in that: A stirring rod is rotatably embedded in the cover body, and the top of the stirring rod is in transmission connection with the transmission shaft.

10. A mineral vitamin emulsification apparatus according to claim 1, characterized in that: An annular groove is formed in the cover body, teeth are arranged on the outer side wall of the annular groove, a transmission gear is arranged on the top of the stirring rod, the transmission gear is in meshing connection with the outer side wall and the transmission shaft respectively, and the transmission shaft and the stirring rod are in synchronous rotation and revolution.

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