A yeast fermentation enzymolysis device and an enzymolysis method thereof

Abstract

This invention discloses a yeast fermentation enzymatic hydrolysis device and method, relating to the field of yeast fermentation enzymatic hydrolysis technology. It includes a base and a fermentation tank, rotatably mounted on the top of the base; a hollow stirring shaft rotatably mounted inside the fermentation tank, with several blades mounted on its side; a shaft seal mounted on the stirring shaft for support and sealing the connection between the fermentation tank and the stirring shaft; a first drive unit located on the top of the fermentation tank for driving the stirring shaft to rotate; a second drive unit located on the top of the base for driving the fermentation tank to rotate; and a cleaning unit located inside the stirring shaft for cleaning the connection between the stirring shaft and the blades, as well as the gaps inside the shaft seal. This invention can clean the gaps at the connection between the stirring shaft and the shaft seal, as well as the substrate residue remaining on the lower end face of the connection between the stirring shaft and the blades, preventing substrate residue in the fermentation tank from causing mold growth and affecting the next fermentation.

Description

Technical Field

[0001] This invention relates to the field of yeast fermentation enzymatic hydrolysis technology, specifically to a yeast fermentation enzymatic hydrolysis device and its enzymatic hydrolysis method. Background Technology

[0002] During yeast fermentation, yeast uses enzymes produced within its cells to break down (enzymatically decompose) external nutrients. Appropriate stirring during yeast fermentation aids the process. For medium to large-sized fermenters, magnetic coupling transmission cannot be used due to limitations in torque transmission capacity. To prevent leakage of the fermentation broth and contamination by other microorganisms, a shaft seal is required where the stirring shaft passes through the tank. (Refer to the attached instruction manual.) Figure 1 The existing shaft seal is assembled from multiple parts. In order to facilitate the installation of the end cover and the stirring shaft, a clearance fit is used, which results in gaps at the connection between the stirring shaft and the shaft seal. When the stirring shaft is working, the substrate in the tank will splash everywhere. After fermentation, the substrate residue left in the gaps at the connection between the stirring shaft and the shaft seal, as well as on the lower end face of the connection between the blade and the stirring shaft, is difficult to clean and is prone to mold growth, affecting the next fermentation. Summary of the Invention

[0003] The purpose of this invention is to provide a yeast fermentation enzymatic hydrolysis device and enzymatic hydrolysis method to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a yeast fermentation enzymatic hydrolysis device, comprising a base and a fermentation tank rotatably mounted on the top of the base; a stirring shaft, which is a hollow structure and rotatably mounted inside the fermentation tank, wherein several blades are mounted on the side of the stirring shaft; a shaft seal, mounted on the stirring shaft and used for supporting the stirring shaft and sealing the connection between the fermentation tank and the stirring shaft; a first drive unit, disposed on the top of the fermentation tank and used for driving the stirring shaft to rotate; a second drive unit, disposed on the top of the base and used for driving the fermentation tank to rotate; and a cleaning unit, disposed inside the stirring shaft and capable of cleaning the connection between the stirring shaft and the blades and the gaps inside the shaft seal.

[0005] As a further embodiment of the present invention, the cleaning unit includes a cleaning block, a pipe, and a drive unit; the cleaning block is elastically slidably connected to the stirring shaft along the radial direction of the stirring shaft and multiple cleaning blocks are provided; the multiple cleaning blocks are evenly distributed on the stirring shaft; two symmetrically arranged cleaning chambers are opened inside the cleaning block, and the cleaning chambers are connected to the inner cavity of the stirring shaft; the pipe is fixedly connected to the fermentation tank and one end can be connected to the bottom end of the stirring shaft; the drive unit can drive the cleaning block to slide outward of the stirring shaft when the pipe is connected to the stirring shaft, so that the cleaning chamber is exposed.

[0006] As a further embodiment of the present invention, the driving part includes a sliding column; the sliding column is installed inside the stirring shaft and is elastically slidably connected to the stirring shaft in the vertical direction; a plurality of wedge-shaped push blocks are fixedly connected to the outer wall of the sliding column, the number of wedge-shaped push blocks is equal to the number of cleaning blocks and they are respectively located on the side of the cleaning blocks; the wedge-shaped push blocks can drive the cleaning blocks to slide outward.

[0007] As a further embodiment of the present invention, a sealing ring is fixedly installed at the bottom end of the slide column, and the sealing ring, together with the slide column, can seal the opening at the bottom end of the stirring shaft.

[0008] As a further embodiment of the present invention, the cleaning chamber is configured as a tapered nozzle with a wider inner end and a narrower outer end.

[0009] As a further embodiment of the present invention, a sealing block is provided inside the cleaning chamber, the sealing block is capable of sealing the cleaning chamber, and the sealing block and the cleaning block are slidably connected in the vertical direction.

[0010] As a further embodiment of the present invention, the drive unit includes a motor, which is mounted on the top of the fermenter and its output shaft is fixedly connected to the stirring shaft.

[0011] As a further embodiment of the present invention, the second drive unit includes a second motor, which is mounted on the top of the base and has a first sprocket fixedly connected to its output shaft. The first sprocket is connected to the second sprocket via a chain drive. The second sprocket is fixedly mounted on the rotating shaft of the fermenter.

[0012] A method for yeast fermentation and enzymatic hydrolysis, comprising the following steps:

[0013] Step 1: Add the yeast and substrate to the fermentation tank;

[0014] Step 2: Drive unit 1 drives the stirring shaft to rotate, stirring the yeast and substrate in the fermenter to promote fermentation;

[0015] Step 3: After fermentation is complete, remove the substrate from the fermentation tank;

[0016] Step 4: The cleaning unit inside the stirring shaft starts working to clean the gaps between the stirring shaft and the shaft seal, as well as the dead corners on the lower end face of the connection between the stirring shaft and the blades, to remove any remaining residue.

[0017] Step 5: Rinse the other areas of the fermenter's inner wall that have no blind spots using a water hose;

[0018] Step 6: Dry the fermentation tank and then seal it for storage.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] The present invention, through the arrangement of a stirring shaft, a first driving unit and a second driving unit, drives the stirring shaft to rotate, and the stirring shaft drives the blades to rotate synchronously to stir the substrate; at the same time, the second driving unit drives the fermentation tank to rotate on the support frame; the rotation of the fermentation tank combined with the rotation of the blades can make the substrate in the fermentation tank better turn over, stir and mix, which can greatly improve the stirring and mixing effect of the substrate.

[0021] The present invention, through the setting of a cleaning unit, can clean the gaps at the connection between the stirring shaft and the shaft seal, as well as the substrate residue remaining on the lower end face at the connection between the stirring shaft and the blades, thereby preventing substrate residue in the fermenter from causing mold growth and affecting the next fermentation. Attached Figure Description

[0022] Figure 1 This is a diagram illustrating the background technology of the present invention;

[0023] Figure 2 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 3 This is a schematic cross-sectional view of the overall structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the stirring shaft, shaft seal, and cleaning unit structure of the present invention;

[0026] Figure 5 This is a cross-sectional schematic diagram showing the connection and installation relationship of the stirring shaft, cleaning unit, and pipelines of the present invention.

[0027] Figure 6 for Figure 5 Enlarged view of a portion of point A in the middle;

[0028] Figure 7 for Figure 5 Enlarged view of a section at point B in the middle;

[0029] Figure 8 This is a bottom view of part of the structure of the present invention;

[0030] Figure 9 This is a schematic diagram of the pipeline structure of the present invention;

[0031] Figure 10 This is a schematic diagram of the cleaning block structure of the present invention;

[0032] Figure 11 This is a schematic diagram illustrating the working principle of the sliding column and cleaning block of the present invention;

[0033] Figure 12 This is a schematic diagram of the working state of the cleaning block of the present invention.

[0034] The attached figures are labeled as follows:

[0035] 1-Base, 2-Support frame, 3-Fermentation tank, 4-Mounting frame, 5-Agitator shaft, 6-Shaft seal, 7-Cleaning block, 8-Cleaning chamber, 9-Sliding column, 10-Spring 1, 11-Wedge pusher, 12-Sealing block, 13-Pipe, 14-Spring 2, 15-Motor 1, 16-Motor 2, 17-Sprocket 1, 18-Chain, 19-Sprocket 2, 20-Feeding port, 21-Blade, 22-Sealing ring. Detailed Implementation

[0036] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0037] Please see Figures 1-12 This invention provides a technical solution: a yeast fermentation enzymatic hydrolysis device, comprising a base 1, a support frame 2, a fermentation tank 3, a mounting frame 4, a stirring shaft 5, a shaft seal 6, a drive unit one, a drive unit two, and a cleaning unit; the support frame 2 is fixedly installed on the top of the base 1 and serves to support the fermentation tank 3; the mounting frame 4 is fixedly connected to the outer wall of the fermentation tank 3 and rotatably installed on the top of the base 1; the stirring shaft 5 is a hollow structure and rotatably installed inside the fermentation tank 3, with several blades 21 installed on its side; the shaft seal 6 is installed on the stirring shaft 5 and serves to support the stirring shaft 5 and seal the connection between the fermentation tank 3 and the stirring shaft 5; the drive unit one is located on the top of the fermentation tank 3 and serves to drive the stirring shaft 5 to rotate; the drive unit two is located on the top of the base 1 and serves to drive the fermentation tank 3 to rotate; the cleaning unit is located inside the stirring shaft 5 and can clean the connection between the stirring shaft 5 and the blades 21 and the gaps inside the shaft seal 6.

[0038] refer to Figures 2-3Yeast and substrate are added to fermenter 3 through the feed inlet 20 at the top, and then the feed inlet 20 is closed. When stirring is required, drive unit one drives the stirring shaft 5 to rotate, and the stirring shaft 5 drives the blades 21 to rotate synchronously to stir the substrate. At the same time, drive unit two drives fermenter 3 to rotate on support frame 2. The rotation of fermenter 3, combined with the rotation of blades 21, allows the substrate in fermenter 3 to be better turned, stirred, and mixed, which can greatly improve the stirring and mixing effect of the substrate. After fermentation is completed, the feed inlet 20 is opened, and drive unit two drives fermenter 3 to turn so that the feed inlet 20 faces downward, and the substrate in fermenter 3 can fall out from the feed inlet 20. Then the cleaning unit starts working. The cleaning unit cleans the gaps at the connection between the stirring shaft 5 and the shaft seal 6, as well as the bottom surface of the connection between the stirring shaft 5 and the blade 21, to prevent mold growth caused by residual substrate in the fermenter 3, which could affect the next fermentation. Since the cleaning unit is located inside the stirring shaft 5, it can rotate with the stirring shaft 5 when not in operation, thus avoiding interference with the normal operation of the stirring shaft 5 and other components inside the fermenter 3. It should be noted that the cleaning unit focuses on cleaning the gaps at the connection between the stirring shaft 5 and the shaft seal 6, as well as the hard-to-clean residues in the corners of the bottom surface of the connection between the stirring shaft 5 and the blade 21. For other areas on the inner wall of the fermenter 3 without dead corners, cleaning can be done by direct flushing with a water pipe.

[0039] Specifically, such as Figures 3-8 , Figure 11 as well as Figure 12 As shown, the cleaning unit includes a cleaning block 7, a pipe 13, and a drive unit; the cleaning block 7 is elastically slidably connected to the stirring shaft 5 along the radial direction of the stirring shaft 5 and multiple cleaning blocks 7 are provided; multiple cleaning blocks 7 are evenly distributed on the stirring shaft 5; two symmetrically arranged cleaning chambers 8 are opened inside the cleaning block 7, and the cleaning chambers 8 are connected to the inner cavity of the stirring shaft 5; the pipe 13 is fixedly connected to the fermentation tank 3 and one end can be connected to the bottom end of the stirring shaft 5; the drive unit can drive the cleaning block 7 to slide to the outside of the stirring shaft 5 when the pipe 13 is connected to the stirring shaft 5, so that the cleaning chambers 8 are exposed.

[0040] When the cleaning unit is working, one end of pipe 13 is inserted into the bottom end of stirring shaft 5, and pipe 13 is connected to the inner cavity of stirring shaft 5; when pipe 13 is connected to the bottom end of stirring shaft 5, the drive unit can slide cleaning block 7 to the outside of stirring shaft 5, and the end of cleaning chamber 8 away from the inner cavity of stirring shaft 5 moves to the outside of stirring shaft 5; it should be noted that, Figure 12 As shown, when the cleaning block 7 moves to its outermost position, the port of the cleaning chamber 8 is completely removed; then, cleaning water is injected into the pipe through the other end of the pipe 13, and the cleaning water enters the inner cavity of the stirring shaft 5 along the pipe 13; after the cleaning water fills the inner cavity of the stirring shaft 5, it enters the cleaning chamber 8 and sprays out from the outer end of the cleaning chamber 8; as shown Figure 4 and Figure 5As shown, multiple cleaning blocks 7 are evenly arranged on the stirring shaft 5, and the cleaning blocks 7 are located between the shaft seal 6 and the blades 21. The cleaning water sprayed from the cleaning chamber 8 above the top cleaning block 7 and the cleaning chamber 8 below the bottom cleaning block 7 can be sprayed along the outer wall of the stirring shaft 5 into the gap between the shaft seal 6 and the stirring shaft 5, washing away the substrate residue remaining in the gap. The cleaning water sprayed from the cleaning chamber 8 in the cleaning block 7 located in the middle area of ​​the stirring shaft 5 can be sprayed into the area where the stirring shaft 5 connects with the blades 21, washing away the substrate residue remaining at the connection. This can prevent the substrate from remaining in the dead corners of the fermentation tank 3 after fermentation, which would affect the next fermentation.

[0041] Specifically, such as Figures 5-7 , Figure 11 and Figure 12 As shown, the drive unit includes a sliding column 9; the sliding column 9 is installed inside the stirring shaft 5 and is elastically slidably connected to the stirring shaft 5 in the vertical direction; a number of wedge-shaped push blocks 11 are fixedly connected to the outer wall of the sliding column 9, the number of wedge-shaped push blocks 11 is equal to the number of cleaning blocks 7 and they are located on the side of the cleaning blocks 7 respectively; the wedge-shaped push blocks 11 can drive the cleaning blocks 7 to slide outward.

[0042] When one end of pipe 13 is inserted into the bottom end of stirring shaft 5, the end of pipe 13 will push the sliding column 9 upward; (Reference) Figure 11 When the sliding column 9 drives the wedge-shaped pusher 11 to move upward in the v1 direction, the wedge-shaped pusher 11 can drive the cleaning block 7 to move outward in the v2 direction through the wedge-shaped surface until the cleaning block 7 moves to Figure 12 As shown, the cleaning chamber 8 is moved out, and cleaning water can be sprayed out from the cleaning chamber to rinse the dead corners on the stirring shaft 5, blades 21 and shaft seal 6.

[0043] It should be noted that the elastic sliding connection (installation) described above refers to a structure in which parts can automatically return to their original position after sliding, including, but not limited to, the spring structure shown in the illustration; such as Figure 6 and Figure 10 As shown, a spring 10 is connected to the inner wall of the cleaning block 7, and the end of the spring 10 away from the cleaning block 7 is connected to the inner wall of the stirring shaft 5; as Figure 6 As shown, a second spring 14 is connected to the top of the slide column 9, and the end of the second spring 14 away from the slide column 9 is connected to the inner wall of the top of the stirring shaft; the first spring 10 and the second spring 14 are used for the automatic reset of the cleaning block 7 and the slide column 9, respectively.

[0044] Specifically, such as Figure 7 As shown, a sealing ring 22 is fixedly installed at the bottom of the slide column 9. The sealing ring 22, together with the slide column 9, can seal the opening at the bottom of the stirring shaft 5.

[0045] When pipe 13 is not in operation, under the downward pre-tightening force applied to the sliding column 9 by spring 2 14, the lower end face of the sealing ring 22 is tightly fitted to the inner wall of the bottom end of the stirring shaft 5; the sliding column 9, in conjunction with the sealing ring 22, ensures that the bottom end of the stirring shaft 5 is in a sealed state, guaranteeing that the cleaning unit does not affect the sealing of the fermenter 3; such as Figure 9 As shown, when the pipe 13 is connected to the bottom end of the stirring shaft 5, the pipe 13 can lift the sliding column 9 upward. The end of the pipe 13 is provided with a notch, through which the cleaning water can enter the stirring shaft 5. It should be noted that the connection between the pipe 13 and the stirring shaft 5 can be achieved by a linear drive mechanism (such as a cylinder, linear motor, etc.) or by manual operation, which is relatively simple and will not be described in detail here. Optionally, the pipe 13 can also be used as a channel for injecting gas (such as oxygen) into the fermentation tank 3. The gas is sprayed into the fermentation material through the inner cavity of the stirring shaft 5 and the cleaning chamber 8.

[0046] Specifically, such as Figure 10 The cleaning chamber 8 is designed as a tapered nozzle with a wider inner end and a narrower outer end; this increases the speed at which the cleaning water is sprayed out of the cleaning chamber 8, thereby improving the flushing force on residues in gaps and joints.

[0047] Specifically, such as Figure 10 and Figure 12 As shown, a sealing block 12 is provided inside the cleaning chamber 8. The sealing block 12 can block the cleaning chamber 8, and the sealing block 12 and the cleaning block 7 are slidably connected in the vertical direction.

[0048] refer to Figure 12 , Figure 12 The shaded area represents the area filled with cleaning water. The sealing block 12 in the upper cleaning chamber 8 blocks the upper cleaning chamber 8 under the action of gravity, while the sealing block 12 in the lower cleaning chamber 8 moves downward to the lowest point under the action of gravity, and the lower cleaning chamber 8 is in the open state. This reduces the number of cleaning chambers 8 that are open, increases the speed at which the cleaning water is sprayed out of the cleaning chambers 8, and ensures that only the lower cleaning chamber 8 is always open. The cleaning water is sprayed downwards, and the cleaning water sprayed from the two adjacent cleaning blocks 7 does not interact with each other, which can greatly improve the cleaning effect. The drive unit 2 then drives the fermentation tank 3 to rotate. When the fermentation tank 3 rotates 180°, the two cleaning chambers 8 in the cleaning block 7 switch positions. Under the sealing action of the sealing block 12, the two cleaning chambers 8 open intermittently, and the cleaning water is always sprayed downwards, without affecting the cleaning effect.

[0049] Specifically, such as Figure 2 As shown, the drive unit includes a motor 15, which is mounted on the top of the fermenter 3 and its output shaft is fixedly connected to the stirring shaft 5; the motor 15 can drive the stirring shaft 5 to rotate.

[0050] Specifically, such as Figure 2As shown, the second drive unit includes a second motor 16, which is mounted on the top of the base 1 and has a first sprocket 17 fixedly connected to its output shaft. The first sprocket 17 is connected to a second sprocket 19 via a chain 18. The second sprocket 19 is fixedly mounted on the rotating shaft of the fermenter 3. The second motor 16 can drive the fermenter 3 to rotate via the first sprocket 17, the chain 18 and the second sprocket 19.

[0051] A method for yeast fermentation and enzymatic hydrolysis, comprising the following steps:

[0052] Step 1: Add the yeast and substrate to fermentation tank 3;

[0053] Step 2: Drive unit 1 drives the stirring shaft 5 to rotate, stirring the yeast and substrate in fermenter 3 to promote fermentation;

[0054] Step 3: After fermentation is complete, remove the substrate from fermentation tank 3;

[0055] Step 4: The cleaning unit inside the stirring shaft 5 starts working to clean the gap between the stirring shaft 5 and the shaft seal 6, as well as the dead corners of the lower end face where the stirring shaft 5 connects to the blade 21.

[0056] Step 5: Rinse the other areas of the inner wall of fermenter 3 with water using a direct water hose;

[0057] Step 6: Dry fermenter 3 and then seal it for storage.

[0058] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0059] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A yeast fermentation enzymatic hydrolysis device, comprising a base (1), characterized in that: Also includes Fermentation tank (3) is rotatably mounted on top of base (1); The stirring shaft (5) is a hollow structure and is rotatably installed inside the fermenter (3). Several blades (21) are installed on the side of the stirring shaft (5). Shaft seal (6), installed on the stirring shaft (5) and used for supporting the stirring shaft (5) and sealing the connection between the fermenter (3) and the stirring shaft (5); Drive unit 1 is located on the top of the fermenter (3) and is used to drive the stirring shaft (5) to rotate; Drive unit 2 is located on the top of the base (1) and is used to drive the fermenter (3) to rotate; The cleaning unit is located inside the stirring shaft (5) and can clean the connection between the stirring shaft (5) and the blade (21) and the gap inside the shaft seal (6); The cleaning unit includes a cleaning block (7), a pipe (13), and a drive unit; The cleaning block (7) is elastically slidably connected to the stirring shaft (5) along the radial direction of the stirring shaft (5) and multiple such blocks are provided; the multiple cleaning blocks (7) are evenly distributed on the stirring shaft (5); the cleaning block (7) has two symmetrically arranged cleaning chambers (8) inside, and the cleaning chambers (8) are connected to the inner cavity of the stirring shaft (5); The pipe (13) is fixedly connected to the fermenter (3) and one end can be connected to the bottom end of the stirring shaft (5); The drive unit can drive the cleaning block (7) to slide to the outside of the stirring shaft (5) when the pipe (13) is connected to the stirring shaft (5), so that the cleaning chamber (8) is exposed; The driving unit includes a sliding column (9); the sliding column (9) is installed inside the stirring shaft (5) and is elastically slidably connected to the stirring shaft (5) in the vertical direction; a number of wedge-shaped push blocks (11) are fixedly connected to the outer wall of the sliding column (9), the number of wedge-shaped push blocks (11) is equal to the number of cleaning blocks (7) and they are located on the side of the cleaning blocks (7); the wedge-shaped push blocks (11) can drive the cleaning blocks (7) to slide outward.

2. The yeast fermentation enzymatic hydrolysis device according to claim 1, characterized in that: A sealing ring (22) is fixedly installed at the bottom of the slide column (9). The sealing ring (22) works with the slide column (9) to seal the opening at the bottom of the stirring shaft (5).

3. The yeast fermentation enzymatic hydrolysis device according to claim 1, characterized in that: The cleaning chamber (8) is configured as a tapered nozzle with a wider inner end and a narrower outer end.

4. The yeast fermentation enzymatic hydrolysis device according to claim 1, characterized in that: A sealing block (12) is provided inside the cleaning chamber (8). The sealing block (12) can block the cleaning chamber (8). The sealing block (12) and the cleaning block (7) are slidably connected in the vertical direction.

5. The yeast fermentation enzymatic hydrolysis device according to claim 1, characterized in that: The drive unit includes a motor (15), which is mounted on the top of the fermenter (3) and its output shaft is fixedly connected to the stirring shaft (5).

6. The yeast fermentation enzymatic hydrolysis device according to claim 1, characterized in that: The second drive unit includes a second motor (16), which is mounted on the top of the base (1) and has a first sprocket (17) fixedly connected to its output shaft. The first sprocket (17) is connected to the second sprocket (19) via a chain (18). The second sprocket (19) is fixedly mounted on the rotating shaft of the fermenter (3).

7. A yeast fermentation enzymatic hydrolysis method, applicable to the yeast fermentation enzymatic hydrolysis apparatus according to any one of claims 1-6, characterized in that, The method includes the following steps: Step 1: Add the yeast and substrate to the fermentation tank (3); Step 2: Drive unit 1 drives the stirring shaft (5) to rotate, stirring the yeast and substrate in the fermentation tank (3) to promote fermentation; Step 3: After fermentation is complete, remove the substrate from the fermentation tank (3); Step 4: The cleaning unit inside the stirring shaft (5) starts working to clean the gap between the stirring shaft (5) and the shaft seal (6) and the dead corner of the lower end face of the connection between the stirring shaft (5) and the blade (21) to remove the residue. Step 5: Use a water hose to rinse the other areas of the fermenter (3) that have no dead corners; Step 6: Dry the fermentation tank (3) and then seal it for storage.

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