Stirring device for fermentation tank

Abstract

The invention relates to the technical field of biological fermentation, and particularly discloses a stirring device for a fermentation tank, the stirring device comprises a stirring assembly, the stirring assembly comprises a stirring barrel, an end cover is fixed at the top of the stirring barrel in a sealing manner, a motor is fixed at the top of the end cover, and a hollow motor shaft coaxial with the stirring barrel is arranged in the center of the motor; the motor shaft penetrates through the end cover and is in sliding connection with a stirring shaft through a connecting piece; the interior of the connecting piece is hollow and is provided with a sliding groove I which is in sliding connection with the motor shaft, and the outer wall of the connecting piece is provided with a plurality of air holes I which are communicated with the interior of the stirring barrel; air holes II are formed in two ends of the motor shaft, one end is communicated with the connecting piece, and the air hole II in the other end is communicated with the external environment; a plurality of groups of supporting shafts are fixedly connected along the length direction of the stirring shaft, and every two supporting shafts form one group, so that the problem that the existing stirring device is single in stirring effect and function is solved.

Description

Technical Field

[0001] This invention relates to the field of bio-fermentation technology, and in particular to a stirring device for a fermenter. Background Technology

[0002] In many fields such as bio-fermentation, food processing, and pharmaceuticals, fermenters are indispensable key equipment. Their core function is to provide a suitable environment for the growth, metabolism, and chemical reactions of microorganisms to achieve the efficient production of target products. The stirring device, as a crucial component of the fermenter, plays a vital role in the fermentation process.

[0003] Traditional fermenters typically have simple mixing devices, usually relying solely on a mixing shaft to drive a mixing paddle for unidirectional rotation and mixing.

[0004] This mixing method has many limitations, such as uneven mixing effect and limited functionality.

[0005] Specifically, stirring in one direction makes it difficult to fully mix materials in different locations within the fermenter, resulting in stirring dead zones within the tank. Materials in some areas cannot be fully mixed, leading to inconsistent microbial growth environments and affecting fermentation efficiency and product quality.

[0006] Traditional mixing devices primarily focus on material mixing and have limited capacity to handle gases generated during fermentation. If these gases are not promptly released, they may accumulate inside the tank, affecting the respiration and metabolic activities of microorganisms, and potentially leading to excessive pressure and safety issues. Furthermore, for fermentation processes requiring specific gas environments, such as anaerobic fermentation, traditional mixing devices struggle to achieve effective gas control.

[0007] With the continuous development of biotechnology and the increasing demands for the quality of fermentation products, the limitations of traditional fermentation tank stirring devices have become increasingly apparent, making it difficult to meet the high-efficiency, stable, and precise production needs of modern fermentation industry.

[0008] Therefore, a stirring device for fermenters is proposed to solve the problems of poor stirring effect and limited functionality of existing stirring devices. Summary of the Invention

[0009] The purpose of this invention is to provide a stirring device for fermenters to solve the problems mentioned in the background art.

[0010] To achieve the above objectives, the present invention adopts the following technical solution: A stirring device for a fermenter includes a stirring assembly, the stirring assembly including a stirring tank, the top of the stirring tank being sealed and fixed with an end cap, a motor being fixed to the top of the end cap, a motor shaft being arranged at the center of the motor and being coaxial with the stirring tank and hollow inside, the motor shaft passing through the end cap and being slidably connected to a stirring shaft through a connector; The connector is hollow inside and has a sliding groove that is slidably connected to the motor shaft. The outer wall of the connector has several air holes that communicate with the inside of the mixing tank. The motor shaft has two air holes at both ends, one end of which is connected to the connector, and the other end of which is connected to the external environment. Several sets of support shafts are fixedly connected along the length of the stirring shaft, with two support shafts forming a set. The two support shafts are arranged symmetrically based on the center of the stirring shaft, and the end of the support shaft away from the stirring shaft is rotatably connected to a sliding component. The inner wall of the mixing tank is spirally surrounded by a corrugated plate, which has a regular corrugation and its surface is tightly fitted and fixed to the inner wall of the mixing tank. The sliding assembly includes a rotating shaft rotatably connected to the stirring shaft, and a stirring paddle arranged symmetrically around the axis is fixedly connected to the outer wall of the rotating shaft. A limiting block is fixed at the end of the rotating shaft away from the stirring shaft. The limiting block faces the corrugated plate and has a sliding groove in the longitudinal direction. A limiting wheel is fixedly connected to the bottom of the sliding groove, and a sliding wheel is slidably connected to the top of the sliding groove. The distance between the sliding wheel and the limiting wheel is adapted to the thickness of the corrugated plate, so that the corrugated plate can be embedded between the two and roll relative to each other.

[0011] Preferably, an annular groove is coaxially formed at the center of the bottom of the mixing tank, and the depth of the annular groove is greater than that of other areas at the bottom of the mixing tank, so as to facilitate the collection of fermentation liquid; multiple liquid outlet channels are evenly formed at the bottom of the annular groove, which penetrate the bottom of the mixing tank, and each liquid outlet channel is connected to the interior of the liquid collection tank.

[0012] Preferably, a filter disc is detachably fixed inside the annular groove by bolts. The filter disc is made of stainless steel porous filter material, and its outer diameter is adapted to the inner diameter of the annular groove, completely covering the annular groove area.

[0013] Preferably, a sealing disc is fitted inside the liquid outlet channel with a gap. The sealing disc is made of corrosion-resistant rubber and its diameter is larger than the total coverage area of ​​the liquid outlet channel, so as to completely cover the upper opening of all liquid outlet channels. The sealing disc is tightly fitted to the bottom of the annular groove at the bottom of the mixing tank.

[0014] Preferably, a lifting mechanism is fixedly connected to the bottom center of the sealing disc by bolts. The lifting mechanism includes a support arm and a cylinder. The support arm has a cross-shaped structure, with its center fixed to the bottom of the sealing disc and both ends extending to the outside of the mixing tank. Two cylinders are symmetrically hinged to the outer wall of the mixing tank. The cylinder body end is hinged to the outer wall of the mixing tank through a hinge seat. The output end of the cylinder is set vertically upward and is hinged to the end of the support arm through a hinge block.

[0015] Preferably, the end cap is symmetrically provided with a liquid inlet and a solid inlet along the circumference. The liquid inlet is used to introduce liquid fermentation materials or additives, and the solid inlet is used to introduce solid fermentation raw materials. Both the liquid inlet and the solid inlet are equipped with sealing caps.

[0016] Preferably, a solid feeding component is provided on one side of the mixing component. The solid feeding component includes a support and a conveying auger mounted on the support. The conveying auger is arranged at an inclination and conveys materials in a bottom-to-top direction. The feeding end of the conveying auger is provided with a feeding hopper to facilitate the centralized feeding of solid raw materials. Its conveying end extends directly above the solid feeding port of the end cover, and the discharge port of the conveying end corresponds to the position of the solid feeding port to ensure that the conveyed solid raw materials can fall accurately into the mixing tank.

[0017] Preferably, the conveying auger is equipped with a drive motor, and the feeding rate is controlled by adjusting the speed of the drive motor.

[0018] Preferably, the corrugated plate has a regular waveform structure, and its corrugation direction forms a preset angle with the axis of the mixing tank.

[0019] Preferably, a liquid collection tank is bolted to the bottom of the mixing tank. The liquid collection tank has an open top structure, and its open end is tightly fitted to the bottom of the mixing tank.

[0020] The beneficial effects of this invention are as follows: This invention involves setting a support shaft on the stirring shaft, with the support shaft connected to a sliding assembly that rolls along the corrugated plate inside the mixing tank. During this rolling process, the stirring shaft not only rotates but also moves vertically. Simultaneously, the rotating shaft oscillates slightly around the support shaft, thus enabling the stirring paddle to achieve a combined rotational and oscillating motion. This multi-dimensional stirring method allows for all-around and multi-angle stirring of the fermentation material, effectively reducing dead zones and ensuring more uniform mixing of the material within the tank. This provides a more consistent growth environment for microorganisms, thereby improving fermentation efficiency and product quality. The device features a unique gas channel structure. The movement of the stirring shaft, driven by a motor shaft, air vents on the connectors, and a sliding assembly, enables the automatic opening and closing of the air vents. During fermentation, the device automatically discharges gases generated within the tank as needed, preventing gas accumulation from affecting microbial respiration and metabolic activities, thus ensuring smooth fermentation. Furthermore, this gas channel structure can be connected to gas collection devices or introduce specific gases to meet different fermentation requirements, enabling precise control of the gas environment within the fermenter and satisfying the needs of various fermentation processes, including anaerobic and aerobic fermentation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of an embodiment of the present invention; Figure 3 This is a schematic diagram of the sliding component structure according to an embodiment of the present invention; Figure 4 This is an embodiment of the present invention. Figure 3 A magnified view of region A; Figure 5 This is a schematic diagram of the lifting mechanism structure according to an embodiment of the present invention; Figure 6 This is a schematic diagram of the solid feeding assembly structure according to an embodiment of the present invention.

[0022] In the diagram: 1. Stirring assembly; 101. Stirring tank; 1011. Annular groove; 1012. Liquid outlet channel; 1013. Filter plate; 1014. Sealing plate; 102. End cap; 1021. Liquid inlet; 1022. Solid inlet; 103. Motor; 1031. Motor shaft; 10311. Air hole two; 1032. Connector; 10321. Sliding groove one; 10322. Air hole one; 104. Stirring shaft; 105. Support shaft; 106. Corrugated plate; 2. Sliding assembly; 201. Rotating shaft; 202. Stirring paddle; 203. Limiting block; 2031. Sliding groove two; 2032. Limiting wheel; 2033. Sliding wheel; 3. Liquid collection tank; 4. Lifting mechanism; 401. Support arm; 402. Cylinder; 5. Solid feeding assembly; 501. Conveying auger. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0024] Specifically, refer to Figures 1-6A stirring device for a fermenter includes a stirring assembly 1, wherein the stirring assembly 1 includes a stirring tank 101, the stirring tank 101 being made of stainless steel and having good corrosion resistance and sealing performance, and is used to contain fermentation materials. The top of the mixing tank 101 is fixedly connected to an end cap 102 via a sealing structure. The sealing structure includes a sealing groove formed on the top end face of the mixing tank 101 and a sealing ring embedded in the groove. The end cap 102 is locked and fixed to the mixing tank 101 with bolts to ensure that the inside of the mixing tank 101 is sealed and to prevent leakage of fermentation materials or contamination by miscellaneous bacteria. A motor 103 is fixedly installed on the top of the end cap 102 via a bracket. The motor 103 provides power output to the mixing device.

[0025] The output end of the motor 103 is provided with a hollow motor shaft 1031 coaxial with the mixing tank 101 to ensure uniform mixing force; the motor shaft 1031 passes through the end cover 102 and extends into the interior of the mixing tank 101, and is slidably connected to the mixing shaft 104 through the connector 1032.

[0026] The connector 1032 is a hollow structure, and its interior has a sliding groove 10321 adapted to the motor shaft 1031. The motor shaft 1031 is slidably connected to the connector 1032 through the sliding groove 10321. The outer wall of the connector 1032 has a plurality of air holes 10322, each of which is connected to the hollow interior of the connector 1032 and to the interior of the mixing tank 101, for introducing gas into the fermentation material.

[0027] Both ends of the motor shaft 1031 are provided with air holes 10311. One air hole 10311 is connected to the hollow interior of the connector 1032, and the other air hole 10311 is connected to the external environment, forming a through gas channel.

[0028] Several sets of support shafts 105 are fixedly connected along the length of the stirring shaft 104. Each set of support shafts 105 consists of two support shaft units. The two support shaft units are arranged symmetrically about the axis of the stirring shaft 104 and are perpendicular to the stirring shaft 104. A sliding component 2 is rotatably connected to one end of each support shaft 105 away from the stirring shaft 104. The sliding component 2 rotates synchronously with the stirring shaft 104 and can roll along the corrugated plate 106 on the inner wall of the mixing tank 101 to achieve multi-dimensional stirring.

[0029] As the sliding component 2 rolls along the corrugated plate 106 on the inner wall of the mixing tank 101, it drives the stirring shaft 104 to move vertically. During the movement of the stirring shaft 104, it drives the first air hole 10322 to rise, so that the first air hole 10322 partially overlaps with the motor shaft 1031. The first air hole 10322 is covered by the motor shaft 1031, thus closing the first air hole 10322. As the sliding component 2 continues to roll, it drives the first air hole 10322 to fall, so that the first air hole 10322 opens. The gas produced by fermentation in the mixing tank 101 enters the interior of the connector 1032 through the first air hole 10322. Since the connector 1032 is connected to the second air hole 10311, the gas inside the connector 1032 is discharged from the second air hole 10311 at the other end through the internal channel of the motor shaft 1031 and the second air hole 10311. The second air hole 10311 at the other end is used to connect a gas collection device or directly introduce the gas into the air.

[0030] The inner wall of the mixing tank 101 is spirally surrounded by a corrugated plate 106, the surface of which is tightly fitted and fixed to the inner wall of the mixing tank 101.

[0031] The corrugated plate 106 has a regular waveform structure, such as a sine wave or a triangular wave. Its corrugation direction forms a preset angle with the axis of the mixing tank 101. During the mixing process, it can guide the fermentation material to form a spiral upward or downward flow trajectory, enhance the axial mixing of the material, and reduce the dead corners of the mixing. The sliding assembly 2 includes a rotating shaft 201, which is rotatably connected to the end of the support shaft 105 away from the stirring shaft 104; two sets of stirring paddles 202 are fixedly connected to the outer wall of the rotating shaft 201, and the two sets of stirring paddles 202 are symmetrically arranged about the axis of the rotating shaft 201. The surface of the stirring paddle 202 is perpendicular to the rotating shaft 201. When rotating, it can generate radial stirring force on the surrounding materials, enhancing the local mixing effect. The edge of the stirring paddle 202 adopts an arc transition design to reduce stirring resistance and avoid excessive shearing damage to the microorganisms in the fermentation materials.

[0032] A limiting block 203 is fixed to one end of the rotating shaft 201 away from the support shaft 105. The limiting block 203 has a sliding groove 2031 longitudinally formed on the side facing the corrugated plate 106. A limiting wheel 2032 is fixedly connected to the inner bottom of the sliding groove 2031, and a sliding wheel 2033 is slidably connected to the inner top of the sliding groove 2031. The distance between the sliding wheel 2033 and the limiting wheel 2032 is adapted to the thickness of the corrugated plate 106, so that the corrugated plate 106 can be embedded between the two and roll relative to each other. When the stirring shaft 104 drives the sliding component 2 to rotate, the limiting wheel 2032 and the sliding wheel 2033 roll along the wave trajectory of the corrugated plate 106. Since the corrugated plate 106 has a certain slope, it drives the rotating shaft 201 to oscillate slightly around the support shaft 105, thereby enabling the stirring paddle 202 to achieve a compound motion of rotation and oscillation, which greatly improves the uniformity of stirring.

[0033] In some preferred embodiments, a liquid collection tank 3 is bolted to the bottom of the mixing tank 101. The liquid collection tank 3 has a box structure with an open top, and its open end is tightly fitted to the bottom of the mixing tank 101. A sealing gasket is provided between the two to seal and collect the fermentation liquid after mixing to prevent leakage.

[0034] In some preferred embodiments, an annular groove 1011 is coaxially formed at the bottom center of the mixing tank 101. The depth of the annular groove 1011 is greater than that of other areas at the bottom of the mixing tank 101, which facilitates the collection of fermentation liquid. Multiple liquid outlet channels 1012 are uniformly formed at the bottom of the annular groove 1011, which penetrate the bottom of the mixing tank 101. Each liquid outlet channel 1012 is connected to the interior of the liquid collection tank 3. After the fermentation liquid is stirred, it can flow quickly into the liquid collection tank 3 from the liquid outlet channel 1012 under the action of gravity, thereby improving the discharge efficiency.

[0035] In some preferred embodiments, a filter disc 1013 is detachably fixed inside the annular groove 1011 by bolts. The filter disc 1013 is made of stainless steel porous filter material, and its outer diameter is adapted to the inner diameter of the annular groove 1011, so as to completely cover the area of ​​the annular groove 1011. The pore size of the filter disc 1013 is set according to the requirements of the fermentation material, and is used to filter impurities, undissolved material particles, etc. in the fermentation liquid, blocking impurities in the mixing tank 101, ensuring the purity of the collected liquid, and the detachable design facilitates subsequent cleaning and replacement.

[0036] In some preferred embodiments, a sealing disc 1014 is fitted inside the liquid outlet channel 1012 with a gap. The sealing disc 1014 is made of corrosion-resistant rubber and its diameter is larger than the total coverage area of ​​the liquid outlet channel 1012, which can completely cover the upper opening of all the liquid outlet channels 1012. The sealing disc 1014 is tightly fitted to the bottom of the annular groove 1011 at the bottom of the mixing tank 101, which is used to seal the bottom of the mixing tank 101 during the mixing process to prevent the fermentation liquid from leaking prematurely and to ensure the mixing and fermentation effect.

[0037] In some preferred embodiments, a lifting mechanism 4 is bolted to the bottom center of the sealing disc 1014. The lifting mechanism 4 includes a support arm 401 and a cylinder 402. The support arm 401 has a cross-shaped structure, with its center fixed to the bottom of the sealing disc 1014 and both ends extending to the outside of the mixing tank 101. Two cylinders 402 are symmetrically hinged to the outer wall of the mixing tank 101. The cylinder body end of the cylinder 402 is hinged to the outer wall of the mixing tank 101 through a hinge seat. The output end of the cylinder 402 is vertically upward and is hinged to the end of the support arm 401 through a hinge block to achieve stable power transmission.

[0038] When mixing is complete and discharge is required, cylinder 402 is activated. The output end of cylinder 402 retracts, causing support arm 401 to move downward. Simultaneously, support arm 401 causes sealing disc 1014 to detach downward from the bottom of mixing tank 101, opening liquid outlet channel 1012. At this time, the fermentation liquid in mixing tank 101 is filtered by filter disc 1013 and flows smoothly into liquid collection tank 3 through liquid outlet channel 1012, completing liquid collection. After discharge, the output end of cylinder 402 extends, causing sealing disc 1014 to reset and reseal liquid outlet channel 1012.

[0039] In some preferred embodiments, the end cap 102 is symmetrically provided with a liquid inlet 1021 and a solid inlet 1022 along the circumferential direction. The liquid inlet 1021 is used to introduce liquid fermentation materials or additives, and the solid inlet 1022 is used to feed solid fermentation raw materials. Both the liquid inlet 1021 and the solid inlet 1022 are equipped with sealing caps. The sealing caps are detachably connected to the inlets by threads or snaps. After feeding is completed, the sealing caps are closed to ensure the airtightness of the inside of the mixing tank 101 and to prevent the entry of miscellaneous bacteria or material splashing.

[0040] In some preferred embodiments, a solid feeding component 5 is provided on one side of the stirring component 1 to realize automated continuous feeding of solid raw materials and reduce the intensity of manual operation. The solid feeding component 5 includes a support and a conveying auger 501 installed on the support. The conveying auger 501 is arranged at an inclination and conveys materials from bottom to top. The feeding end of the conveying auger 501 is provided with a feeding hopper to facilitate centralized feeding of solid raw materials. Its conveying end extends to directly above the solid feeding port 1022 of the end cover 102, and the discharge port of the conveying end corresponds to the position of the solid feeding port 1022 to ensure that the conveyed solid raw materials can fall accurately into the stirring tank 101. The conveying auger 501 is equipped with a drive motor, and the feeding rate can be controlled by adjusting the speed of the drive motor to adapt to the raw material input requirements of different fermentation stages.

[0041] Working principle: When fermentation is needed to obtain the required materials, open the sealing caps of the liquid inlet 1021 and solid inlet 1022 on the end cap 102, pour the liquid fermentation material or additives into the mixing tank 101 from the liquid inlet 1021, and put the solid fermentation raw materials into the mixing tank 101 from the solid inlet 1022.

[0042] Specifically, the solid fermentation raw materials are placed into the feed hopper of the conveying auger 501 through the solid feeding component 5. The drive motor is started, and the conveying auger 501 conveys the solid raw materials from bottom to top to the feeding end, where they fall precisely into the mixing tank 101. After feeding is completed, the sealing cover is closed.

[0043] Once the solid fermentation raw materials and liquid fermentation materials have completely entered the mixing tank 101 and reached the required amount, the motor 103 is started. The output end of the motor 103 drives the hollow motor shaft 1031 to rotate, and the motor shaft 1031 drives the mixing shaft 104 to rotate through the connector 1032.

[0044] When the stirring shaft 104 rotates, the support shaft 105 drives the sliding component 2 to rotate synchronously. The limiting wheel 2032 and the sliding wheel 2033 in the sliding component 2 roll along the wave trajectory of the corrugated plate 106. Since the corrugated plate 106 has a certain slope, it drives the rotating shaft 201 to oscillate slightly around the support shaft 105, so that the stirring paddle 202 can realize the compound motion of rotation and oscillation, and carry out multi-dimensional stirring of the fermentation material.

[0045] As the sliding component 2 rolls along the corrugated plate 106, it drives the stirring shaft 104 to move vertically. When the stirring shaft 104 moves, it causes the first vent 10322 to rise or fall. When the first vent 10322 rises and partially overlaps with the motor shaft 1031, the first vent 10322 is covered and closed by the motor shaft 1031. When the first vent 10322 falls, it opens, and the gas produced by fermentation in the stirring tank 101 enters the interior of the connector 1032 through the first vent 10322, and then exits through the internal channel of the motor shaft 1031 and the second vent 10311 at the other end. It can be connected to a gas collection device or directly introduced into the air.

[0046] After stirring is completed, the cylinder 402 in the lifting mechanism 4 is activated. The output end of the cylinder 402 retracts, causing the support arm 401 to move downward. The support arm 401 causes the sealing disc 1014 to move downward and disengage from the bottom of the stirring tank 101, thus opening the liquid outlet channel 1012.

[0047] The fermentation liquid in the mixing tank 101 is filtered by the filter plate 1013 and flows into the liquid collection tank 3 through the liquid outlet channel 1012.

[0048] After the material is discharged, the output end of cylinder 402 extends, driving the sealing disc 1014 to reset and reseal the liquid outlet channel 1012.

[0049] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A stirring device for a fermenter, characterized in that, The system includes a stirring assembly (1), which includes a stirring tank (101). The top of the stirring tank (101) is sealed with an end cap (102). A motor (103) is fixed on the top of the end cap (102). The motor (103) has a motor shaft (1031) that is coaxial with the stirring tank (101) and hollow inside. The motor shaft (1031) passes through the end cap (102) and is slidably connected to a stirring shaft (104) through a connector (1032). The connector (1032) is hollow inside and has a sliding groove (10321) that is slidably connected to the motor shaft (1031). The outer wall of the connector (1032) has several air holes (10322) that communicate with the inside of the mixing tank (101). The motor shaft (1031) has two air holes (10311) at both ends. One end is connected to the connector (1032), and the other end of the air hole (10311) is connected to the external environment. Several sets of support shafts (105) are fixedly connected along the length of the stirring shaft (104). Each set consists of two support shafts (105). The two support shafts (105) are arranged symmetrically based on the center of the stirring shaft (104). The end of the support shaft (105) away from the stirring shaft (104) is rotatably connected to the sliding assembly (2). The inner wall of the mixing tank (101) is spirally surrounded by a corrugated plate (106), which is a regular corrugated plate and its surface is tightly fitted and fixed to the inner wall of the mixing tank (101). The sliding assembly (2) includes a rotating shaft (201) rotatably connected to the stirring shaft (104), and a stirring paddle (202) arranged symmetrically around the axis is fixedly connected to the outer wall of the rotating shaft (201). A limiting block (203) is fixed at one end of the rotating shaft (201) away from the stirring shaft (104). The limiting block (203) faces the corrugated plate (106) and has a sliding groove (2031) in the longitudinal direction. A limiting wheel (2032) is fixedly connected to the bottom of the sliding groove (2031), and a sliding wheel (2033) is slidably connected to the top of the sliding groove (2031). The distance between the sliding wheel (2033) and the limiting wheel (2032) is adapted to the thickness of the corrugated plate (106), so that the corrugated plate (106) can be embedded between the two and roll relative to each other.

2. The stirring device for a fermenter according to claim 1, characterized in that, The bottom center of the mixing tank (101) is provided with an annular groove (1011) and the groove depth of the annular groove (1011) is greater than that of other areas at the bottom of the mixing tank (101) to facilitate the collection of fermentation liquid; the bottom of the annular groove (1011) is provided with multiple liquid outlet channels (1012) that penetrate the bottom of the mixing tank (101), and each liquid outlet channel (1012) is connected to the interior of the liquid collection tank (3).

3. A stirring device for a fermenter according to claim 2, characterized in that, A filter disc (1013) is detachably fixed inside the annular groove (1011) by bolts. The filter disc (1013) is made of stainless steel porous filter material, and its outer diameter is adapted to the inner diameter of the annular groove (1011), completely covering the area of ​​the annular groove (1011).

4. A stirring device for a fermenter according to claim 3, characterized in that, The liquid outlet channel (1012) is fitted with a sealing disc (1014) with a gap. The sealing disc (1014) is made of corrosion-resistant rubber and its diameter is larger than the total coverage area of ​​the liquid outlet channel (1012), which can completely cover the upper opening of all liquid outlet channels (1012). The sealing disc (1014) is tightly fitted to the bottom of the annular groove (1011) at the bottom of the stirring tank (101).

5. A stirring device for a fermenter according to claim 4, characterized in that, The bottom center of the sealing disc (1014) is fixedly connected to a lifting mechanism (4) by bolts. The lifting mechanism (4) includes a support arm (401) and a cylinder (402). The support arm (401) has a cross-shaped structure, its center is fixed to the bottom of the sealing disc (1014), and its two ends extend to the outside of the mixing tank (101). The outer wall of the mixing tank (101) is symmetrically hinged with two cylinders (402). The cylinder body end of the cylinder (402) is hinged to the outer wall of the mixing tank (101) through a hinge seat. The output end of the cylinder (402) is set vertically upward and is hinged to the end of the support arm (401) through a hinge block.

6. A stirring device for a fermenter according to claim 5, characterized in that, The end cap (102) is symmetrically provided with a liquid inlet (1021) and a solid inlet (1022) along the circumferential direction. The liquid inlet (1021) is used to introduce liquid fermentation materials or additives, and the solid inlet (1022) is used to input solid fermentation raw materials. Both the liquid inlet (1021) and the solid inlet (1022) are equipped with sealing caps.

7. A stirring device for a fermenter according to claim 6, characterized in that, A solid feeding assembly (5) is provided on one side of the stirring assembly (1). The solid feeding assembly (5) includes a bracket and a conveying auger (501) installed on the bracket. The conveying auger (501) is arranged at an inclination and conveys materials from bottom to top. The feeding end of the conveying auger (501) is provided with a feeding hopper to facilitate the centralized feeding of solid raw materials. Its conveying end extends to the solid feed port (1022) of the end cover (102) directly above it, and the discharge port of the conveying end corresponds to the position of the solid feed port (1022) to ensure that the conveyed solid raw materials can fall accurately into the stirring tank (101).

8. A stirring device for a fermenter according to claim 7, characterized in that, The conveying auger (501) is equipped with a drive motor, and the feeding rate is controlled by adjusting the speed of the drive motor.

9. A stirring device for a fermenter according to claim 8, characterized in that, The corrugated plate (106) has a regular waveform structure, and its corrugation direction forms a preset angle with the axis of the mixing tank (101).

10. A stirring device for a fermenter according to claim 9, characterized in that, The bottom of the mixing tank (101) is fixed with a liquid collection tank (3) by bolts. The liquid collection tank (3) has a box structure with an open top, and its open end is tightly fitted to the bottom of the mixing tank (101).

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