Multi-layer biological fermentation tank

Abstract

The invention belongs to the technical field of biological fermentation tanks, and particularly relates to a multi-layer biological fermentation tank which comprises a tank body, a first stirring part and a second stirring part, a third partition plate, a second partition plate and a first partition plate are mounted on the inner wall of the tank body from top to bottom, and liquid guide pipes are mounted at the bottoms of the third partition plate, the second partition plate and the first partition plate and used for liquid circulation. A transmission part I is arranged between the inner top wall of the tank body and the partition plate III, the transmission part I is used for driving the stirring part II to intermittently rotate, a transmission part II is arranged between the partition plate I and the inner bottom wall of the tank body, and the transmission part II is used for driving the stirring part I to intermittently rotate; through the intermittent rotation design of the stirring part I and the stirring part II, bubbles generated by stirring in materials have more time to rise and crack in a static stage when the stirring blades stop rotating, and compared with continuous stirring, continuous and massive generation of new foams in the fermentation process can be effectively reduced, and the adverse effect of foam accumulation on the fermentation process is reduced.

Description

Technical Field

[0001] This invention relates to the field of bio-fermentation tank technology, and more particularly to a multi-layer bio-fermentation tank. Background Technology

[0002] Fermentation tanks, as a type of microbial cultivation reactor, can mix materials evenly and achieve efficient synthesis of target products by providing a controllable physicochemical environment for microorganisms or cells. Fermentation tanks are very common in current industrial applications, replacing traditional fermentation containers such as culture bottles, sauce vats, and wine cellars, effectively improving efficiency and output.

[0003] Multi-layer fermenters are devices used in biological fermentation processes. Their design features a multi-layered internal structure, with materials flowing from top to bottom. Each layer undergoes a specific reaction. The upper layer facilitates microbial propagation and rapid consumption of easily degradable substrates, while the lower layer is the main fermentation stage, where products are synthesized in large quantities. Currently, multi-layer fermenters use a single stirring structure. However, while the upper layer requires thorough mixing of the fermenting material for microbial propagation, the decomposition products easily leave residues on the inner wall of the fermenter during substrate degradation. Conversely, during the fermentation process in the lower layer, the fermentation products cannot be quickly mixed because the high-speed centrifugation process can cause the death of microorganisms in the fermentation products, leading to contamination of the fermentation broth and reduced purity. This lack of differentiated mixing of the fermenting materials in different states between the upper and lower layers is problematic, as illustrated in publication number CN1. A multi-layer bio-fermentation tank (20665690A) includes a fermentation tank body, a fixing plate inside the fermentation tank body to divide the tank into layers, a stirring drum inside the fermentation tank body for mixing and stirring the fermentation material, a cleaning scraper on the outer periphery of the stirring drum for scraping and cleaning the inner wall of the fermentation tank, and a pushing assembly inside the stirring drum body for pushing the scraper, the pushing assembly including support rods installed around the stirring drum body. The invention uses a torsion rod under a torsion plate to twist back and forth, which drives a dispersing plate, a dispersing rod, and an annular agitator plate to twist and rotate the fermentation product back and forth, mixing and stirring the fermented product with low stirring force. A rotating disk under the rotating shaft, in conjunction with an auxiliary rod, assists in mixing and stirring the fermentation product, mixing and stirring the upper and lower layers of the fermentation tank body in different ways, and using a cleaning scraper to scrape and clean the inner wall of the fermentation tank body.

[0004] However, the aforementioned patent employs continuous stirring to promote material mixing and uniform fermentation. However, this continuous stirring constantly entrains air from the material, generating a large amount of foam. Excessive foam not only occupies the effective space of the fermenter, reducing the actual fermentation volume, but also affects gas exchange and heat transfer during fermentation, leading to an unstable fermentation environment and consequently impacting the quality and yield of the fermentation products. For example, in some aerobic fermentation processes, foam hinders sufficient contact between oxygen and the material, inhibiting microbial growth due to anaerobic conditions and reducing fermentation efficiency. Summary of the Invention

[0005] To address the aforementioned problems, this invention proposes a multi-layer bio-fermentation tank, which more precisely solves the problems mentioned in the background section.

[0006] This invention is achieved through the following technical solution: This invention proposes a multi-layer bio-fermentation tank, comprising a tank body, a stirring section 1, and a stirring section 2. The inner wall of the tank body is equipped with a partition 3, a partition 2, and a partition 1 from top to bottom. Liquid guide pipes are installed at the bottom of each of the partitions 3, 2, and 1 for liquid flow. A transmission section 1 is disposed between the inner top wall of the tank body and the partition 3, and the transmission section 1 is used to drive the intermittent rotation of the stirring section 2. A transmission section 2 is disposed between the partition 1 and the inner bottom wall of the tank body, and the transmission section 2 is used to drive the intermittent rotation of the stirring section 1. A support section is disposed on the outer wall of the tank body to support the tank body. A drive section is installed on the support section to drive the rotation of the transmission sections 1 and 2.

[0007] Preferably, the transmission part one includes a rotating rod one, a chain transmission mechanism one, a pinion and a gear ring one. The rotating rod one is mounted above the partition plate three and rotatably connected to its bearing. The chain transmission mechanism one is installed between the rotating rod one and the stirring part two, which is used to drive the stirring part two to rotate when the rotating rod one rotates. A pinion is installed on the outer wall of the rotating rod one, and a gear ring one is provided on the inner wall of the tank. The gear ring one and the pinion are meshed and connected, so that the pinion is driven to rotate when the gear ring one rotates.

[0008] Preferably, the transmission part two includes a rotating rod two, a chain transmission mechanism two, a large gear and a gear ring two. The rotating rod two is mounted above the partition plate three and rotatably connected to its bearing. The chain transmission mechanism two is installed between the rotating rod two and the stirring part one, which is used to drive the stirring part one to rotate when the rotating rod two rotates. A large gear is installed on the outer wall of the rotating rod two, and a gear ring two is provided on the inner wall of the tank. The gear ring two is meshed with the large gear, which is used to drive the large gear to rotate when the gear ring two rotates.

[0009] Preferably, the number of teeth on the second gear ring and the first gear ring is the same, and the number of teeth on the large gear is set to be three times the number of teeth on the small gear, in order to reduce the rotational speed of the first stirring section.

[0010] Preferably, the distribution range of the inner wall teeth of the first and second toothed rings is only one-third of their inner circumference, which is used to stop the rotation of the first and second stirring parts when their smooth surfaces come into contact with the small gear and the large gear, and is used for the intermittent rotation of the first and second stirring parts.

[0011] Preferably, the stirring part one includes a stirring rod one installed at a part of the partition and rotatably connected to its bearing, the outer wall of the stirring rod one is equipped with stirring blades one, and the end of the stirring rod one is connected to the chain drive mechanism two.

[0012] Preferably, the stirring part two includes a stirring rod two installed on the partition two, a stirring blade two installed on the outer wall of the stirring rod two, the end of the stirring rod two extending through to the top of the partition three and connected to the chain drive mechanism one, and the stirring rod two being rotatably connected to the partition two and the partition three through bearings.

[0013] Preferably, the support includes a load-bearing plate disposed below the tank body, a support rod installed above the load-bearing plate, the support rod being used to support the bottom of the tank body and fix the tank body, a support frame being installed on the top of the load-bearing plate, and the drive unit being installed at the support frame.

[0014] Preferably, the drive unit includes a motor mounted above the support frame. A transmission rod is mounted on the output end of the motor. The transmission rod passes through the interior through a sealed bearing. A mounting bracket is mounted on the end of the transmission rod. The bottom of the mounting bracket is connected to a gear ring for driving the gear ring to rotate. A U-shaped frame is mounted on the surface of the transmission rod, extending to the bottom of the tank. A transmission rod is mounted on the top of the U-shaped frame, passing through the interior through a sealed bearing. A mounting bracket is mounted on the end of the transmission rod, and the mounting bracket is connected to the gear ring.

[0015] Preferably, an inlet pipe is provided at the top of the tank body for injecting materials into the tank body, and a drain pipe is installed at the bottom of the tank body for discharging materials. Valves are installed at both the guide pipe and the drain pipe for controlling the opening and closing of the guide pipe and the drain pipe.

[0016] Compared with the prior art, the present invention provides a multi-layer bio-fermentation tank, which has the following beneficial effects: This multi-layer bio-fermenter, through the intermittent rotation design of stirring section one and stirring section two, allows bubbles generated by stirring in the material to rise and burst more time during the static stage when the stirring blades stop rotating. Compared with continuous stirring, this can effectively reduce the continuous and large-scale generation of new foam during fermentation and reduce the adverse effects of foam accumulation on the fermentation process.

[0017] This multi-layered bio-fermenter uses partitions to create different layers, each with its own independent stirring section. This layered, independent stirring structure allows for more precise stirring control based on the fermentation state and foaming conditions of the materials in different layers. For example, stirring parameters can be adjusted appropriately for layers with more foam to more effectively break down the foam structure and optimize the defoaming environment within the overall fermenter.

[0018] This multi-layered bioreactor, through the design of its liquid guide pipes and valves, allows for control of liquid flow between different compartments. During fermentation, by appropriately controlling the opening of the liquid guide pipe valves, the liquid flows orderly between different compartments, helping to carry the foam generated in the upper layer due to stirring to the lower layer or out of the tank, enhancing the fermenter's ability to remove foam and maintaining the stability of the fermentation process. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a multi-layer bio-fermentation tank proposed in this invention; Figure 2 This is a cross-sectional view of the structure of a multi-layer bio-fermentation tank proposed in this invention; Figure 3 This is a schematic diagram of the transmission part of a multi-layer bio-fermentation tank proposed in this invention; Figure 4 This is a schematic diagram of the transmission part 2 of a multi-layer bio-fermentation tank proposed in this invention; Figure 5 This is a top sectional view of the structure of a multi-layer bio-fermentation tank proposed in this invention; Figure 6 This is a top sectional view of the structure of a multi-layer bio-fermentation tank proposed in this invention.

[0020] In the diagram: 1. Tank body; 11. Inlet pipe; 12. Drain pipe; 13. Partition 1; 14. Partition 2; 15. Guide pipe; 16. Partition 3; 2. Stirring section 1; 21. Stirring rod 1; 22. Stirring blade 1; 3. Stirring section 2; 31. Stirring rod 2; 32. Stirring blade 2; 4. Transmission section 1; 41. Rotating rod 1; 42. Chain transmission mechanism 1; 43. Pinion; 44. Gear ring 1; 45. Mounting frame 1; 5. Transmission section 2; 51. Rotating rod 2; 52. Chain transmission mechanism 2; 53. Large gear; 54. Gear ring 2; 55. Mounting frame 2; 6. Support section; 61. Load-bearing plate; 62. Support rod; 63. Support frame; 7. Drive section; 71. Motor; 72. Transmission rod 1; 73. C-shaped frame; 74. Transmission rod 2. Detailed Implementation

[0021] To more clearly and completely illustrate the technical solution of the present invention, the present invention will be further described below with reference to the accompanying drawings. Example

[0022] like Figures 1-6 This invention discloses a multi-layer bio-fermentation tank according to one embodiment, comprising a tank body 1, a first stirring section 2, and a second stirring section 3. From top to bottom, partitions 16, 14, and 13 are sequentially installed on the inner wall of the tank body 1. Liquid guide pipes 15 are installed at the bottom of each of the partitions 16, 14, and 13. Liquid flow between different partitions can be achieved by controlling the opening of valves at the liquid guide pipes 15. A transmission section 4 is provided between the inner top wall of the tank body 1 and the third partition 16, which can drive the second stirring section 3 to rotate intermittently. A transmission section 5 is provided between the first partition 13 and the inner bottom wall of the tank body 1, which can drive the first stirring section 2 to rotate intermittently. A support section 6 is provided on the outer wall of the tank body 1 to support the tank body 1. A drive section 7 is installed at the support section 6, which can simultaneously drive the first transmission section 4 and the second transmission section 5 to rotate. In the actual fermentation process, the drive unit 7 drives the transmission unit 4 and the transmission unit 5, thereby causing the stirring unit 2 and the stirring unit 3 to rotate intermittently, so as to stir the materials in different compartments in the tank 1 and promote uniform fermentation.

[0023] In this invention, the transmission unit 4 has the following specific structure: a rotating rod 41 is installed above a partition plate 16 and is rotatably connected to the partition plate 16 via a bearing. A chain drive mechanism 42 is installed between the rotating rod 41 and the stirring unit 3. When the rotating rod 41 rotates, the stirring unit 3 is driven to rotate through the transmission action of the chain drive mechanism 42. A small gear 43 is installed on the outer wall of the rotating rod 41, and a gear ring 44 is provided on the inner wall of the tank 1, with the gear ring 44 and the small gear 43 meshing together. When the gear ring 44 rotates, it drives the small gear 43 to rotate through meshing transmission, thereby causing the rotating rod 41 to rotate. In actual operation, the drive unit drives the gear ring 44 to rotate, and the small gear 43 rotates accordingly, driving the stirring unit 3 to rotate through the chain drive mechanism 42, thus realizing the stirring function.

[0024] In this invention, the transmission unit 2 5 has the following specific structure: a rotating rod 2 51 is installed above the partition plate 3 16 and is rotatably connected to the partition plate 3 16 via a bearing. A chain transmission mechanism 2 52 is installed between the rotating rod 2 51 and the stirring unit 1 2. When the rotating rod 2 51 rotates, the stirring unit 1 2 is driven to rotate via the chain transmission mechanism 2 52. A large gear 53 is installed on the outer wall of the rotating rod 2 51, and a gear ring 2 54 is provided on the inner wall of the tank 1, with the gear ring 2 54 and the large gear 53 meshing together. When the gear ring 2 54 rotates, it drives the large gear 53 to rotate via meshing transmission, thereby causing the rotating rod 2 51 to rotate. In actual operation, the drive unit drives the gear ring 2 54 to rotate, and the large gear 53 rotates accordingly, driving the stirring unit 1 2 to rotate via the chain transmission mechanism 2 52, thus completing the stirring operation.

[0025] In this invention, the number of teeth on gear ring 2 54 and gear ring 1 44 are set to be the same, while the number of teeth on the large gear 53 is set to three times the number of teeth on the small gear 43. Since the gear transmission ratio is related to the number of gear teeth, under the same gear ring rotation conditions, the rotational speed of the large gear 53 driving the rotating rod 2 51 will be lower than the rotational speed of the small gear 43 driving the rotating rod 1 41, thereby reducing the rotational speed of the stirring section 2. In the actual fermentation process, the different rotational speeds of stirring section 2 and stirring section 3 can meet the stirring needs of different fermentation stages or different materials, resulting in better fermentation effects.

[0026] In this invention, the number of teeth on the inner walls of both toothed ring 44 and toothed ring 54 is set to be only one-third of their circumference. When toothed ring 44 and toothed ring 54 rotate, their toothed portions mesh with pinion 43 and gear 53, driving pinion 43 and gear 53 to rotate, which in turn causes stirring section 2 and stirring section 3 to rotate. When they rotate to the point where their smooth surfaces contact pinion 43 and gear 53, the pinion 43 and gear 53 stop rotating due to the lack of tooth meshing, thus achieving intermittent rotation of stirring section 2 and stirring section 3. This intermittent rotation allows the material to have an appropriate resting time during fermentation, which is beneficial for the growth and metabolism of microorganisms and improves fermentation quality.

[0027] In this invention, the stirring unit 2 has the following specific structure: a stirring rod 21 is installed at a partition 13 and is rotatably connected to the partition 13 via a bearing. Stirring blades 22 are installed on the outer wall of the stirring rod 21, and the stirring blades 22 can stir the material as the stirring rod 21 rotates. The end of the stirring rod 21 is connected to a chain drive mechanism 52. When the chain drive mechanism 52 in the transmission unit 5 is in operation, it drives the stirring rod 21 to rotate, thereby causing the stirring blades 22 to stir the material below the partition 13, promoting material mixing and fermentation.

[0028] In this invention, the specific structure of the stirring unit 2 3 is as follows: A stirring rod 2 31 is installed at the partition 2 14 and is rotatably connected to the partition 2 14 via a bearing. Simultaneously, the stirring rod 2 31 extends above the partition 3 16 and is rotatably connected to the partition 3 16 via a bearing. A stirring blade 2 32 is installed on the outer wall of the stirring rod 2 31, and the stirring blade 2 32 can rotate with the stirring rod 2 31 to stir the material. The end of the stirring rod 2 31 extends above the partition 3 16 and is connected to the chain drive mechanism 1 42. When the chain drive mechanism 1 42 in the transmission unit 1 4 is activated, it drives the stirring rod 2 31 to rotate, causing the stirring blade 2 32 to stir the material between the partition 2 14 and the partition 3 16, ensuring uniform fermentation of the material in this area.

[0029] In this invention, the support part 6 has the following specific structure: a load-bearing plate 61 is provided below the tank body 1, and a support rod 62 is installed above the load-bearing plate 61. One end of the support rod 62 is fixedly connected to the load-bearing plate 61, and the other end contacts the bottom of the tank body 1, serving to support the bottom of the tank body 1 and simultaneously fixing the tank body 1 to prevent it from shaking. A support frame 63 is installed on top of the load-bearing plate 61. The support frame 63 is a frame structure used to install the drive part 7, providing a stable installation position for the drive part 7.

[0030] In this invention, the drive unit 7 has the following specific structure: a motor 71 is installed above the support frame 63, serving as a power source. A transmission rod 72 is installed at the output end of the motor 71, passing through the tank 1 and extending into it via a sealed bearing. A mounting bracket 45 is installed at the end of the transmission rod 72, with its bottom connected to a gear ring 44. When the motor 71 starts, it drives the transmission rod 72 to rotate, which in turn drives the gear ring 44 to rotate via the mounting bracket 45. A U-shaped bracket 73 is installed on the surface of the transmission rod 72, extending to the bottom of the tank 1. A transmission rod 74 is installed at the top of the U-shaped bracket 73, passing through the tank 1 and extending into it via a sealed bearing. A mounting bracket 55 is installed at the end of the transmission rod 74, connected to the gear ring 54. When transmission rod 72 rotates, it drives transmission rod 74 to rotate through bracket 73, which in turn drives gear ring 54 to rotate through mounting bracket 55, thus enabling one motor to drive two transmission parts simultaneously, simplifying the structure and reducing costs.

[0031] In this invention, an inlet pipe 11 is provided at the top of the tank body 1, communicating with the interior of the tank body 1, through which fermentation material can be injected into the tank body 1. A drain pipe 12 is installed at the bottom of the tank body 1, communicating with the interior of the tank body 1, through which the fermented material can be discharged after fermentation. Valves are installed at both the guide pipe 15 and the drain pipe 12. By controlling the opening and closing of the valves, the opening and closing of the guide pipe 15 and the drain pipe 12 can be controlled, achieving flow control of the material at different stages and ensuring the smooth progress of the fermentation process.

[0032] In this invention, fermentation material is injected into tank 1 through the inlet pipe 11 above tank 1, while the valves at the guide pipe 15 and the drain pipe 12 are closed. The motor 71 mounted on the support frame 63 is started, and the motor 71, acting as a power source, drives the transmission rod 72 to rotate. When the transmission rod 72 rotates, it drives the gear ring 44 to rotate via the mounting frame 45. Since the gear ring 44 and the pinion 43 are meshed, the rotation of the gear ring 44 drives the pinion 43 to rotate, which in turn causes the rotating rod 41 to rotate. A chain drive mechanism 42 is installed between the rotating rod 41 and the stirring section 3. The rotation of the rotating rod 41, through the transmission action of the chain drive mechanism 42, drives the stirring rod 31 of the stirring section 3 to rotate. The stirring blades 32 on the outer wall of the stirring rod 31 rotate accordingly, stirring the material between the partition 14 and the partition 16. When transmission rod 72 rotates, it drives transmission rod 74 to rotate via frame 73. Transmission rod 74 then drives gear ring 54 to rotate via mounting frame 55. Because gear ring 54 meshes with large gear 53, the rotation of gear ring 54 drives large gear 53 to rotate, which in turn causes rotating rod 51 to rotate. A chain drive mechanism 52 is installed between rotating rod 51 and stirring section 2. The rotation of rotating rod 51 drives stirring rod 21 of stirring section 2 to rotate via chain drive mechanism 52. The stirring blades 22 on the outer wall of stirring rod 21 rotate accordingly, stirring the material below partition 13.

[0033] Since the number of teeth on the inner walls of toothed ring 44 and toothed ring 54 is only one-third of their circumference, when toothed ring 44 and toothed ring 54 rotate, the toothed parts mesh with the small gear 43 and the large gear 53, driving the small gear 43 and the large gear 53 to rotate, which in turn causes stirring part 2 and stirring part 3 to rotate. When they rotate to the point where the smooth surface contacts the small gear 43 and the large gear 53, the small gear 43 and the large gear 53 stop rotating due to the lack of tooth meshing. This achieves intermittent rotation of stirring part 2 and stirring part 3, allowing the material to have an appropriate static time during fermentation, which is beneficial to the growth and metabolism of microorganisms. The number of teeth on gear ring 2 54 and gear ring 1 44 are set to be the same, while the number of teeth on the large gear 53 is set to three times the number of teeth on the small gear 43. Under the same gear ring rotation conditions, the rotational speed of the large gear 53 driving the rotating rod 2 51 is lower than the rotational speed of the small gear 43 driving the rotating rod 1 41, thereby reducing the rotational speed of the stirring section 1 2. The different rotational speeds of stirring section 1 2 and stirring section 2 3 can meet the stirring needs of different fermentation stages or different materials. During fermentation, according to actual needs, the valve at the liquid guide pipe 15 is opened to allow liquid to flow between different compartments, enabling material to flow between different compartments and further promoting uniform fermentation. After fermentation is complete, the valve at the drain pipe 12 is opened, and the fermented material is discharged from tank 1 through the drain pipe 12.

[0034] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A multi-layer bio-fermentation tank, comprising a tank body (1), a first stirring section (2), and a second stirring section (3), characterized in that, The inner wall of the tank (1) is equipped with partition three (16), partition two (14) and partition one (13) from top to bottom. Liquid guide pipes (15) are installed at the bottom of partition three (16), partition two (14) and partition one (13) for liquid flow. A transmission part one (4) is provided between the inner top wall of the tank (1) and partition three (16). The transmission part one (4) is used to drive the stirring part two (3) to rotate intermittently. A transmission part two (5) is provided between partition one (13) and the inner bottom wall of the tank (1). The transmission part two (5) is used to drive the stirring part one (2) to rotate intermittently. A support part (6) is provided on the outer wall of the tank (1). The support part (6) is used to support the tank (1). A drive part (7) is installed on the support part (6). The drive part (7) is used to drive the rotation of transmission part one (4) and transmission part two (5).

2. The multi-layer bio-fermentation tank according to claim 1, characterized in that, The transmission part 1 (4) includes a rotating rod 1 (41), a chain transmission mechanism 1 (42), a pinion (43) and a gear ring 1 (44). The rotating rod 1 (41) is mounted above the partition plate 3 (16) and rotatably connected to its bearing. The chain transmission mechanism 1 (42) is installed between the rotating rod 1 (41) and the stirring part 2 (3) for driving the stirring part 2 (3) to rotate when the rotating rod 1 (41) rotates. A pinion (43) is installed on the outer wall of the rotating rod 1 (41). A gear ring 1 (44) is provided on the inner wall of the tank body (1). The gear ring 1 (44) and the pinion (43) are meshed and connected for driving the pinion (43) to rotate when the gear ring 1 (44) rotates.

3. A multi-layer bio-fermentation tank according to claim 2, characterized in that, The transmission part two (5) includes a rotating rod two (51), a chain transmission mechanism two (52), a large gear (53) and a gear ring two (54). The rotating rod two (51) is mounted above the partition three (16) and rotatably connected to its bearing. The chain transmission mechanism two (52) is installed between the rotating rod two (51) and the stirring part one (2) for driving the stirring part one (2) to rotate when the rotating rod two (51) rotates. A large gear (53) is installed on the outer wall of the rotating rod two (51). A gear ring two (54) is provided on the inner wall of the tank body (1). The gear ring two (54) and the large gear (53) are meshed and connected for driving the large gear (53) to rotate when the gear ring two (54) rotates.

4. A multi-layer bio-fermentation tank according to claim 3, characterized in that, The number of teeth on the second gear ring (54) and the first gear ring (44) are the same. The number of teeth on the large gear (53) is set to three times the number of teeth on the small gear (43) to reduce the rotational speed of the first stirring section (2).

5. A multi-layer bio-fermentation tank according to claim 4, characterized in that, The distribution range of the inner wall teeth of the first tooth ring (44) and the second tooth ring (54) is one-third of their inner circumference. When their smooth surfaces come into contact with the small gear (43) and the large gear (53), the rotation of the first stirring part (2) and the second stirring part (3) is stopped, so as to realize the intermittent rotation of the first stirring part (2) and the second stirring part (3).

6. A multi-layer bio-fermentation tank according to claim 5, characterized in that, The stirring part 1 (2) includes a stirring rod 1 (21) installed at the partition 1 (13) and rotatably connected to its bearing. The outer wall of the stirring rod 1 (21) is equipped with stirring blade 1 (22). The end of the stirring rod 1 (21) is connected to the chain drive mechanism 2 (52).

7. A multi-layer bio-fermentation tank according to claim 6, characterized in that, The stirring part 2 (3) includes a stirring rod 2 (31) installed on the partition 2 (14). The stirring rod 2 (31) has stirring blades 2 (32) installed on its outer wall. The end of the stirring rod 2 (31) extends through to the top of the partition 3 (16) and is connected to the chain drive mechanism 1 (42). The stirring rod 2 (31) is rotatably connected to the partition 2 (14) and the partition 3 (16) through bearings.

8. A multi-layer bio-fermentation tank according to claim 7, characterized in that, The support part (6) includes a load-bearing plate (61) disposed below the tank body (1), a support rod (62) is installed above the load-bearing plate (61), the support rod (62) is used to support the bottom of the tank body (1) and fix the tank body (1), a support frame (63) is installed on the top of the load-bearing plate (61), and the drive part (7) is installed at the support frame (63).

9. A multi-layer bio-fermentation tank according to claim 8, characterized in that, The drive unit (7) includes a motor (71) mounted on a support frame (63). A transmission rod (72) is mounted on the output end of the motor (71). The transmission rod (72) extends into the tank (1). A mounting bracket (45) is mounted on the end of the transmission rod (72). The bottom of the mounting bracket (45) is connected to a gear ring (44) to drive the gear ring (44) to rotate. A U-shaped frame (73) is mounted on the surface of the transmission rod (72). The U-shaped frame (73) extends to the bottom of the tank (1). A transmission rod (74) is mounted on the top of the U-shaped frame (73). The transmission rod (74) extends into the tank (1). A mounting bracket (55) is mounted on the end of the transmission rod (74). The mounting bracket (55) is connected to the gear ring (54).

10. A multi-layer bio-fermentation tank according to claim 1, characterized in that, An inlet pipe (11) is provided above the tank body (1) for injecting materials into the tank body (1). A drain pipe (12) is installed at the bottom of the tank body (1) for discharging materials. Valves are installed at both the guide pipe (15) and the drain pipe (12) for controlling the opening and closing of the guide pipe (15) and the drain pipe (12).

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