Clean feed microbial fermentation device and fermentation method

Abstract

The invention relates to the technical field of fermentation devices, in particular to a clean feed microbial fermentation device and a fermentation method.The clean feed microbial fermentation device comprises a fermentation tank, a sampling assembly arranged in the fermentation tank and an exhaust assembly arranged in the fermentation tank; the stirring rod rotates in the fermentation tank so as to promote the fermentation speed of feed microorganisms; the sampling assembly comprises a material pipe located in the fermentation tank, the material pipe comprises a material guiding pipe with one end vertically upward and located on the periphery of the stirring rod, and further comprises a material discharging pipe which is connected to the bottom end of the material guiding pipe and horizontally penetrates out of the fermentation tank; and a plurality of material guiding holes with different heights are downwards formed in the top end of the material guiding pipe. According to the invention, the temperature and the nutrient concentration in the fermentation tank can be kept uniform, so that the fermentation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fermentation devices, and particularly relates to a microbial fermentation device for clean feed and a fermentation method. Background Art

[0002] Biological engineering products include biological drugs, biochemicals, biofuels, brewing foods, etc. The research, development, and manufacturing of these products are inseparable from microbial fermenters. During the microbial fermentation culture process, it is necessary to continuously introduce clean air into the fermenter and discharge gases such as carbon dioxide generated by microbial metabolism.

[0003] When microorganisms ferment in the existing fermenter, a large air pressure will be generated. The traditional pressure relief valve can only automatically open for exhaust when the air pressure in the fermenter reaches the rated value, and the pressure relief effect is poor. When sampling from the inside of the tank during the fermentation process, the sampling depth is single, which affects the sampling effect. Summary of the Invention

[0004] Based on this, it is necessary to provide a microbial fermentation device for clean feed to solve the above technical problems.

[0005] A microbial fermentation device for clean feed, comprising a fermentation tank, a sampling assembly arranged inside the fermentation tank, and an exhaust assembly arranged inside the fermentation tank; a stirring rod is arranged inside the fermentation tank, and the stirring rod rotates inside the fermentation tank to promote the fermentation speed of the material feed microorganisms; the sampling assembly includes a material pipe located inside the fermentation tank, the material pipe is L-shaped, the material pipe includes a material guiding pipe with one end vertically upward and located on the periphery of the stirring rod, and further includes a discharge pipe connected to the bottom end of the material guiding pipe and horizontally penetrating outside the fermentation tank, and a plurality of material guiding holes with different heights are opened downward from the top end of the material guiding pipe. When the stirring rod rotates, the fermented substances inside the fermentation tank can enter the material guiding pipe through each of the material guiding holes with different heights, and finally be discharged uniformly through the discharge pipe; the exhaust assembly includes an exhaust pipe penetrating through the top end of the fermentation tank, one end of the exhaust pipe is exposed outside the top end of the fermentation tank, and an air outlet exposed outside the top end of the fermentation tank is opened in the cross-section direction of the exhaust pipe. A stepped hole is arranged inside the exhaust pipe, and the air outlet is opened on the top small hole section of the stepped hole. The exhaust assembly further includes a plug column slidably installed in the small hole section. A stepped shaft with a diameter smaller than that of the plug column is arranged at the bottom end of the plug column. The stepped shaft enters the large diameter section at the bottom end of the stepped hole and is provided with a push plate located inside the large diameter section. A spring surrounding the stepped shaft is also filled inside the large diameter section. The bottom end of the spring abuts against the top surface of the push plate, and the top end abuts against the shoulder between the large diameter and the small diameter of the stepped hole. When the plug column rises to bring the stepped shaft into the exhaust pipe, an air discharge gap is formed between the stepped shaft and the inner cavity of the exhaust pipe. The bottom end of the air discharge gap communicates with the large diameter section of the stepped hole and communicates with the fermentation tank through the large diameter section, so that the gas in the fermentation tank is finally released and depressurized through the air outlet; a bending part horizontally bent in the radial direction of the fermentation tank is arranged at the top end of the stirring rod, a cam is connected to the bending part, the bottom end of the stepped shaft is vertically downward and exposed inside the fermentation tank, and a lifting rod located on the rotation path of the cam is installed.

[0006] As a further preference, a sealing ring is inlaid on the outer wall of the plug column, and the plug column slides in the inner cavity of the exhaust pipe through the sealing ring.

[0007] As a further preference, a limiting ring blocking the bottom surface of the push plate is installed at the bottom end of the exhaust pipe. A plurality of air injection holes are annularly arranged on the limiting ring. The upper and lower ends of the air injection holes respectively communicate with the stepped large diameter cavity of the exhaust pipe and the inner cavity of the fermentation tank. The air injection holes surround the periphery of the limiting ring.

[0008] As a further preference, the stirring rod is further provided with a vertical part that continues to bend downward along the bent part. A number of helical teeth are installed on the vertical part from top to bottom, and the number of helical teeth is located inside a number of the material guiding holes.

[0009] As a further preference, a loading plate is filled and fixed in the fermentation tank. A bearing seat is inlaid in the middle of the loading plate. The stirring rod is rotatably connected to the bearing seat, and the top surface of the loading plate is close to the material guiding pipe.

[0010] As a further preference, the bottom end of the stepped shaft is vertically downward and inserted into the material guiding pipe. A wool sleeve is installed on the stepped shaft. The wool sleeve is damped on the inner wall of the lumen of the material guiding pipe to block the material guiding hole. When the stepped shaft rises with the plug post, the wool sleeve can be driven to rise from the inside of the material guiding hole and open the material guiding hole from the inside.

[0011] As a further preference, a rotating plate is fixed on the stepped shaft. The lifting rod is connected to the rotating plate. A connecting rod is also movably connected to the rotating plate through an eccentric shaft. A bolt is installed on the fermentation tank through a threaded hole. The inner end of the bolt enters the fermentation tank and is connected to the connecting rod in a transfer manner. When the bolt moves inward and outward, the stepped shaft is driven to rotate through the connecting rod, and the lifting rod is driven by the stepped shaft to move away from the rotation path of the stirring rod.

[0012] The present invention also provides a method for fermenting clean feed microorganisms, which is applicable to the clean feed microorganism fermentation device as described above, and includes the following fermentation steps:

[0013] Step S1: Put the microbial product into the fermentation tank;

[0014] Step S2: Start the motor to drive the stirring rod to rotate to improve the fermentation efficiency;

[0015] Step S3: Operate the bolt to push the connecting rod to drive the rotating plate to rotate, and rotate the lifting rod to the rotation path of the cam by the rotating plate;

[0016] Step S4: Reduce the speed of the motor, drive the cam to rotate through the stirring rod, make the cam contact the lifting rod and push the lifting rod to rise, complete the automatic pressure relief and exhaust of the fermentation tank through the exhaust assembly, and complete the automatic sampling of the fermentation tank through the sampling assembly

[0017] The beneficial effects of the present invention compared with the prior art are:

[0018] The stirring rod rotates with the bent portion, and the bent portion rotates with the cam until it contacts the lifting rod, causing the lifting rod to rise, and the lifting rod causes the stepped shaft to rise, and the stepped shaft causes the blocking column to rise along the small-diameter section at the top of the stepped hole. When the blocking column rises above the air outlet, the air outlet is automatically opened, and at the same time, the stepped shaft rises into the small-diameter section of the stepped hole. Since the diameter of the stepped shaft is smaller than the diameter of the blocking column, when the stepped shaft rises into the small-diameter section of the stepped hole, the high-pressure gas in the fermentation tank enters the small-diameter hole of the stepped hole along the gas unloading gap, and is then automatically discharged and depressurized through the air outlet. The gas pressure relief function can be realized automatically. This automatic method is realized by the rotation of the stirring rod. The stirring rod is located in the fermentation tank and rotates. The fermentation tank is filled with fermented microbial products. When the stirring rod rotates, it not only uses the cam structure to link the exhaust pipe to automatically depressurize and exhaust through the air outlet, but also stirs the microbial products when the stirring rod rotates, making the temperature and nutrient concentration in the fermentation tank uniform, thereby accelerating fermentation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of a clean feed microbial fermentation device provided in an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a cutaway main plan view of a clean feed microbial fermentation device provided by an embodiment of the present invention;

[0021] Figure 3 A partially cutaway schematic diagram of a clean feed microbial fermentation device provided by an embodiment of the present invention;

[0022] Figure 4 A clean feed microbial fermentation device provided by the embodiment of the present invention comprises Figure 3 The enlarged schematic diagram of part A is shown in FIG.

[0023] Figure 5 A clean feed microbial fermentation device provided by the embodiment of the present invention comprises Figure 3 The schematic diagram from the upward perspective is introduced;

[0024] Figure 6 A clean feed microbial fermentation device provided by the embodiment of the present invention comprises Figure 3 Enlarged schematic diagram of part B.

[0025] In the figure: 1, fermentation tank; 2, sampling assembly; 21, material pipe; 211, material guiding pipe; 212, discharge pipe; 213, material guiding hole; 3, exhaust assembly; 31, exhaust pipe; 32, air outlet; 33, stepped hole; 34, plug column; 341, sealing ring; 35, stepped shaft; 351, wool sleeve; 36, push plate; 37, spring; 38, air release gap; 39, limit ring; 391, air injection hole; 4, stirring rod; 41, bending part; 42, cam; 43, lifting rod; 44, vertical part; 45, helical tooth; 5, material loading plate; 6, bearing seat; 7, rotating plate; 8, connecting rod; 9, bolt. Detailed implementation mode

[0026] The following will clearly and completely describe the above and other implementation modes and advantages of the present invention with reference to the accompanying drawings. Obviously, the described implementation modes are only partial implementation modes of the present invention, rather than all implementation modes.

[0027] In one implementation mode, as Figures 1 - 6 shown: A clean feed microbial fermentation device provided in this implementation mode includes a fermentation tank 1, a sampling assembly 2 provided in the fermentation tank 1, and an exhaust assembly 3 provided in the fermentation tank 1;

[0028] A stirring rod 4 is provided in the fermentation tank 1, and the stirring rod 4 rotates in the fermentation tank 1 to promote the fermentation speed of the material feed microorganisms;

[0029] The sampling assembly 2 includes a material pipe 21 located in the fermentation tank 1. The material pipe 21 is L-shaped. The material pipe 21 includes a material guiding pipe 211 with one end vertically upward and located on the periphery of the stirring rod 4, and also includes a discharge pipe 212 connected to the bottom end of the material guiding pipe 211 and horizontally penetrating to the outside of the fermentation tank 1. A number of material guiding holes 213 with different heights are opened downward from the top end of the material guiding pipe 211. When the stirring rod 4 rotates, the fermented matter in the fermentation tank 1 can enter the material guiding pipe 211 through each material guiding hole 213 with different heights, and finally be discharged uniformly by the discharge pipe 212;

[0030] The exhaust assembly 3 includes an exhaust pipe 31 penetrating through the top end of the fermentation tank 1. One end of the exhaust pipe 31 is exposed outside the top end of the fermentation tank 1, and an air outlet 32 exposed outside the top end of the fermentation tank 1 is provided in the cross-sectional direction of the exhaust pipe 31. A stepped hole 33 is provided in the exhaust pipe 31, and the air outlet 32 is opened on the top small hole section of the stepped hole 33. The exhaust assembly 3 further includes a plug 34 slidably installed in the small hole section. A stepped shaft 35 with a diameter smaller than that of the plug 34 is provided at the bottom end of the plug 34. The stepped shaft 35 enters the large diameter section at the bottom end of the stepped hole 33 and is provided with a push plate 36 located in the large diameter section. A spring 37 surrounding the stepped shaft 35 is also filled in the large diameter section. The bottom end of the spring 37 abuts against the top surface of the push plate 36, and the top end abuts against the shoulder between the large diameter and the small diameter of the stepped hole 33. When the plug 34 rises to bring the stepped shaft 35 into the exhaust pipe 31, an air release gap 38 is formed between the stepped shaft 35 and the lumen of the exhaust pipe 31. The bottom end of the air release gap 38 communicates with the large diameter section of the stepped hole 33 and communicates with the fermentation tank 1 through the large diameter section, so that the gas in the fermentation tank 1 is finally released and depressurized through the air outlet 32;

[0031] The top end of the stirring rod 4 is provided with a bent portion 41 horizontally bent in the radial direction of the fermentation tank 1. A cam 42 is connected to the bent portion 41. The bottom end of the stepped shaft 35 is vertically downward and exposed inside the fermentation tank 1, and a lifting rod 43 located on the rotation path of the cam 42 is installed.

[0032] The high-pressure gas generated by the microorganisms after fermentation in the fermentation tank 1 can be automatically discharged outward through the exhaust pipe 31. The working principle is as follows: The stirring rod 4 drives the bent portion 41 to rotate. The bent portion 41 drives the cam 42 to rotate until it contacts the lifting rod 43, which causes the lifting rod 43 to rise. The lifting rod 43 drives the stepped shaft 35 to rise, and the stepped shaft 35 drives the plug 34 to rise along the top small diameter section of the stepped hole 33. When the plug 34 rises above the air outlet 32, the air outlet 32 is automatically opened. At the same time, the stepped shaft 35 rises into the small diameter of the stepped hole 33. Since the diameter of the stepped shaft 35 is smaller than that of the plug 34, when the stepped shaft 35 rises into the small diameter of the stepped hole 33, the high-pressure gas in the fermentation tank 1 enters the small diameter hole of the stepped hole 33 along the air release gap 38, and then is automatically discharged and depressurized through the air outlet 32.

[0033] The gas depressurization function mentioned in this embodiment can be realized automatically. The realization of this automatic method comes from the rotation of the stirring rod 4. The stirring rod 4 rotates in the fermentation tank 1, and the fermentation tank 1 is filled with fermented microbial products. Therefore, when the stirring rod 4 rotates, not only does it use the above-mentioned cam structure to link the exhaust pipe 31 to automatically exhaust outward through the air outlet 32, but also when the stirring rod 4 rotates, it can perform a stirring action on the microbial products, making the temperature and nutrient concentration in the fermentation tank 1 uniform to accelerate the fermentation efficiency.

[0034] The gas pressure relief function mentioned in this embodiment can not only be automated, but also be driven during the rotation of the stirring rod 4. Therefore, every time the stirring rod 4 rotates one week, the exhaust pipe 31 can exhaust to the outside through the air outlet 32 once, so that the fermentation tank 1 can be depressurized once in a short time.

[0035] When the stirring rod 4 drives the bent part 41 to rotate, the cam 42 on the bent part 41 pushes the lifting rod 43 to rise. Then, the lifting rod 43 drives the plug 34 to rise and then fall again in the stepped hole 33, so that the air outlet 32 is quickly opened and then quickly closed. Therefore, the amount of air discharged each time at the air outlet 32 is small. While meeting the pressure relief of the fermentation tank 1, it can also meet the air pressure in the fermentation tank 1 to promote the fermentation of microbial products. Therefore, the lifting rod 43 is set to be vertical, and the lifting method is set to be driven by a small amplitude of the cam.

[0036] In this embodiment, through the rotation and stirring action of the stirring rod 4, the fermented microbial products can also enter each material guiding hole 213 in different depths, and then enter the material guiding pipe 211 through these material guiding holes 213 together, and finally discharge out through the discharge pipe 212. Since the microbial products can be intercepted into the material guiding pipe 211 through each material guiding hole 213 in different depths and then discharged uniformly through the discharge pipe 212, in addition to having a sampling function, it can also improve the sampling quality.

[0037] In this embodiment, a sealing ring 341 is embedded on the outer wall of the plug 34, and the plug 34 slides in the lumen of the exhaust pipe 31 through the sealing ring 341. When the plug 34 is located in the small-diameter section at the top of the stepped hole 33, the large-diameter section is sealed by the sealing ring 341 to prevent the exhaust pipe 31 from exhausting and depressurizing when not discharging gas. Only when the plug 34 rises to bring the stepped shaft 35 into the small-diameter section of the stepped hole 33, the exhaust pipe 31 exhausts and depressurizes only through the air outlet 32.

[0038] In this embodiment, a limit ring 39 is installed at the bottom end of the exhaust pipe 31 to block the bottom surface of the push plate 36. A number of injection holes 391 are formed in an annular array on the limit ring 39. The upper and lower ends of the injection holes 391 communicate with the stepped large-diameter cavity of the exhaust pipe 31 and the inner cavity of the fermentation tank 1 respectively. The injection holes 391 surround the periphery of the limit ring 39. The limit ring 39 is not only the ultimate positioning when the push plate 36 follows the lifting rod 43 to descend, but also the injection holes 391 formed on it communicate with the large-diameter cavity at the bottom end of the stepped hole 33. Through these injection holes 391, the gas in the large-diameter cavity can also communicate with the inner cavity of the fermentation tank 1. When the gas pressure in the fermentation tank 1 is relatively high, it can also enter the large-diameter cavity in advance through these injection holes 391. When the plug 34 rises to open the air outlet 32, the gas that has entered the large-diameter cavity in advance will be quickly discharged through the air outlet 32, improving the pressure relief efficiency.

[0039] In this embodiment, the stirring rod 4 is further provided with a vertical portion 44 that continues to bend downward along the bent portion 41. A number of helical teeth 45 are installed on the vertical portion 44 from top to bottom. The number of helical teeth 45 is located inside a number of material guiding holes 213. When the vertical portion 44 rotates while being inserted into the microbial product, it not only improves the fermentation efficiency, but also when rotating with these helical teeth 45, it can extract the microbial product samples at different depths into each material guiding hole 213, improving the sampling quality.

[0040] In this embodiment, a loading plate 5 is filled and fixed in the fermentation tank 1. A bearing seat 6 is embedded in the middle of the loading plate 5. The stirring rod 4 is rotatably connected to the bearing seat 6. The top surface of the loading plate 5 is close to the material guiding pipe 211, shortening the distance between the microbial product and the material guiding pipe 211. When the stirring rod 4 rotates to stir the material, it can further improve the fermentation efficiency. During the implementation of the assembly, the total discharge pipe will be connected to the loading plate 5, and the materials will be discharged uniformly after fermentation.

[0041] In another embodiment, the bottom end of the stepped shaft 35 is vertically downward and inserted into the feed tube 211. A wool sleeve 351 is installed on the stepped shaft 35. The wool sleeve 351 is made of a sleeve sleeved at the bottom end of the stepped shaft 35 and high-density plush arranged on the outer wall of the sleeve. The wool sleeve 351 is damped on the inner wall of the tube cavity of the feed tube 211 and is used to block the feed hole 213. When the stepped shaft 35 rises with the blocking column 34, it will rise with the wool sleeve 351, so that the wool sleeve 35 can be lifted from the inner side of the feed hole 213. The liner 35 is raised to open the feed hole 213. It can be seen that the component controlling whether the feed tube 211 samples and feeds is the wool sleeve 35. The rising action of the wool sleeve 35 is passively raised by the rising action of the blocking column 34 (or the stepped shaft 35). The purpose of the rising action of the blocking column 34 is to quickly open the gas outlet 32, forcing the fermenter 1 to frequently and slightly relieve pressure. At the same time, the rising action of the blocking column 34 serves as a power source to lift the wool sleeve 35, thereby opening the feed hole 213 and completing sampling. This embodiment can simultaneously perform stirring, exhausting and pressure relief, and sampling, while saving power components.

[0042] In another embodiment, a rotating plate 7 is fixed on the stepped shaft 35, and the lifting rod 43 is connected to the rotating plate 7. The rotating plate 7 is also movably connected to a connecting rod 8 through an eccentric shaft. A bolt 9 is installed on the fermentation tank 1 through a threaded hole. The inner end of the bolt 9 enters the fermentation tank 1 and is connected to the connecting rod 8. When the bolt 9 moves in and out, the stepped shaft 35 is driven to rotate through the connecting rod 8, and the lifting rod 43 is driven by the stepped shaft 35 to move away from the rotation path of the stirring rod 4. When the bolt 9 rotates and pushes outward, the connecting rod 8 is driven inward through its inner end, and the inner end of the connecting rod 8 is movably connected to the rotating plate 7 to rotate counterclockwise, and the rotating plate 7 drives the stepped shaft 35 to rotate counterclockwise, and the stepped shaft 35 drives the lifting rod 43 to rotate counterclockwise, forcing the lifting rod 43 to rotate until it is separated from the cam 42. At this time, the stirring rod 4 will not have any relationship with the lifting rod 43 when rotating with the cam 42, and the lifting rod 43 will not rise. The above-mentioned pressure relief and sampling actions are stopped. Pressure relief and sampling are not required during initial fermentation, and therefore the above-mentioned two functions are stopped at this time, and the above-mentioned two functions have achieved the purpose of controlled use.

[0043] The present invention also provides a clean feed microbial fermentation method, which is suitable for the clean feed microbial fermentation device as described above and includes the following fermentation steps:

[0044] Step S1: putting the microbial product into the fermentation tank 1;

[0045] Step S2: starting the motor to drive the stirring rod 4 to rotate, thereby improving the fermentation efficiency;

[0046] Step S3: operating the bolt 9 to push the connecting rod 8 to drive the rotating plate 7 to rotate, and the rotating plate 7 rotates the lifting rod 43 to the rotation path of the cam 42;

[0047] Step S4: Reduce the rotational speed of the motor, drive the cam 42 to rotate through the stirring rod 4, make the cam 42 contact the lifting rod 43 and push the lifting rod 43 to rise, complete automatic pressure relief and exhaust of the fermentation tank 1 through the exhaust assembly 3, and complete automatic sampling of the fermentation tank 1 through the sampling assembly 2.

[0048] The above orientation references do not represent the specific orientations of the components in this embodiment. This embodiment is only for the convenience of describing the solution and is set with relative descriptions referring to the orientations in the figure. In essence, the specific orientations of the components are based on their actual installation, actual use, and the habitual orientation descriptions of those skilled in the art. This is hereby stated.

[0049] The specific embodiments described above further elaborate on the invention purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above are only the specific embodiments of the present invention and are not used to limit the protection scope of the present invention. It is particularly pointed out that for those skilled in the art, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A microbial fermentation device for clean feed, characterized in that It includes a fermentation tank (1), a sampling assembly (2) arranged inside the fermentation tank (1), and an exhaust assembly (3) arranged inside the fermentation tank (1); a stirring rod (4) is provided inside the fermentation tank (1), and the stirring rod (4) rotates inside the fermentation tank (1) to promote the fermentation speed of the material feed microorganisms; the sampling assembly (2) includes a material pipe (21) located inside the fermentation tank (1), the material pipe (21) is L-shaped, the material pipe (21) includes a material guiding pipe (211) with one end vertically upward and located on the periphery of the stirring rod (4), and further includes a discharge pipe (212) connected to the bottom end of the material guiding pipe (211) and horizontally penetrating outside the fermentation tank (1). A number of material guiding holes (213) with different heights are opened downward from the top end of the material guiding pipe (211). When the stirring rod (4) rotates, the fermented substances inside the fermentation tank (1) can enter the material guiding pipe (211) through each of the material guiding holes (213) with different heights, and are finally discharged uniformly through the discharge pipe (212); the exhaust assembly (3) includes an exhaust pipe (31) penetrating through the top end of the fermentation tank (1). One end of the exhaust pipe (31) is exposed outside the top end of the fermentation tank (1), and an air outlet (32) exposed outside the top end of the fermentation tank (1) is opened in the cross-sectional direction of the exhaust pipe (31). A stepped hole (33) is provided inside the exhaust pipe (31), and the air outlet (32) is opened on the top small hole section of the stepped hole (33). The exhaust assembly (3) further includes a plug column (34) slidably installed in the small hole section. A stepped shaft (35) with a diameter smaller than that of the plug column (34) is provided at the bottom end of the plug column (34). The stepped shaft (35) enters the large diameter section at the bottom end of the stepped hole (33) and is installed with a push plate (36) located inside the large diameter section. A spring (37) surrounding the stepped shaft (35) is also filled inside the large diameter section. The bottom end of the spring (37) abuts against the top surface of the push plate (36), and the top end abuts against the shoulder between the large diameter and small diameter of the stepped hole (33). When the plug column (34) rises to bring the stepped shaft (35) into the exhaust pipe (31), an air release gap (38) is formed between the stepped shaft (35) and the lumen of the exhaust pipe (31). The bottom end of the air release gap (38) communicates with the large diameter section of the stepped hole (33) and communicates with the fermentation tank (1) through the large diameter section, so that the gas in the fermentation tank (1) is finally released and depressurized through the air outlet (32); a bent portion (41) horizontally bent in the radial direction of the fermentation tank (1) is provided at the top end of the stirring rod (4). A cam (42) is connected to the bent portion (41). The bottom end of the stepped shaft (35) is vertically downward and exposed inside the fermentation tank (1), and a lifting rod (43) located on the rotation path of the cam (42) is installed.

2. The microbial fermentation device for clean feed according to claim 1, wherein, A sealing ring (341) is inlaid on the outer wall of the plug post (34), and the plug post (34) slides in the lumen of the exhaust pipe (31) through the sealing ring (341).

3. The cleaning feed microbial fermentation device according to claim 2, wherein, A limiting ring (39) that blocks the bottom surface of the push plate (36) is installed at the bottom end of the exhaust pipe (31). A plurality of air injection holes (391) are arranged in a circular array on the limiting ring (39). The upper and lower ends of the air injection holes (391) communicate with the stepped large-diameter cavity of the exhaust pipe (31) and the inner cavity of the fermentation tank (1) respectively. The air injection holes (391) surround the periphery of the limiting ring (39).

4. The microbial fermentation device for clean feed according to claim 3, characterized in that, The stirring rod (4) further has a vertical part (44) that continues to bend downward along the bending part (41). A plurality of helical teeth (45) are installed on the vertical part (44) from top to bottom. The plurality of helical teeth (45) are located inside the plurality of material guiding holes (213).

5. The clean feed microbial fermentation device according to claim 4, characterized in that, A loading plate (5) is filled and fixed in the fermentation tank (1). A bearing seat (6) is inlaid in the middle of the loading plate (5). The stirring rod (4) is rotatably connected to the bearing seat (6). The top surface of the loading plate (5) is close to the material guiding pipe (211).

6. The microbial fermentation device for clean feed according to claim 5, wherein The bottom end of the stepped shaft (35) vertically extends downward and is inserted into the material guiding pipe (211). A wool sleeve (351) is installed on the stepped shaft (35). The wool sleeve (351) is damped on the inner wall of the lumen of the material guiding pipe (211) to block the material guiding holes (213). When the stepped shaft (35) rises following the plug post (34), it can drive the wool sleeve (351) to rise from the inside of the material guiding holes (213) and open the material guiding holes (213) from the inside.

7. The clean feed microbial fermentation device according to claim 6, wherein A rotating plate (7) is fixed on the stepped shaft (35). The lifting rod (43) is connected to the rotating plate (7). A connecting rod (8) is also movably connected to the rotating plate (7) through an eccentric shaft. A bolt (9) is installed on the fermentation tank (1) through a threaded hole. The inner end of the bolt (9) enters the fermentation tank (1) and is connected to the connecting rod (8). When the bolt (9) moves inward and outward, it drives the stepped shaft (35) to rotate through the connecting rod (8), and the stepped shaft (35) drives the lifting rod (43) away from the rotation path of the stirring rod (4).

8. A method for microbial fermentation of clean feed, applicable to the microbial fermentation device for clean feed as described in claim 7, characterized in that, It includes the following fermentation steps: Step S1: Put the microbial product into the fermentation tank (1); Step S2: Start the motor to drive the stirring rod (4) to rotate to improve the fermentation efficiency; Step S3: Operate the bolt (9) to push the connecting rod (8) to drive the rotating plate (7) to rotate. The rotating plate (7) rotates the lifting rod (43) to the rotation path of the cam (42); Step S4: Reduce the speed of the motor, drive the cam (42) to rotate through the stirring rod (4), make the cam (42) contact the lifting rod (43) and push the lifting rod (43) to rise, and complete the automatic pressure relief and exhaust of the fermentation tank (1) through the exhaust assembly (3), and complete the automatic sampling of the fermentation tank (1) through the sampling assembly (2).

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