A natto fermentation tank with uniform fermentation

Abstract

The application discloses a natto fermentation tank with uniform fermentation, and relates to the technical field of fermentation tanks, which comprises a tank body, a feeding port arranged on the top of the tank body, a base fixedly connected to the top of the tank body, a discharging port fixedly communicated with the bottom of the tank body and a supporting frame arranged on the outer wall of the tank body and used for supporting the tank body, and the tank body further comprises a first pay-off wheel rotatably arranged on the base, a guide rod arranged in the tank body at equal angles and a first connecting block. Through the application, the problems that some fermentation tanks have no partition or flow guide structure, the soybeans are accumulated too thick, the bottom layer of soybeans is insufficient in oxygen due to pressure, the activity of natto bacteria is reduced, fermentation is prolonged, anaerobic bacteria are prone to breeding, and the natto is prone to being metamorphosed into a peculiar smell are solved. In the fermentation middle period, 1-2 times of gentle stirring or displacement are needed, some tanks disperse the soybeans through slow rotation trays or soft tools to exchange the upper and lower layers, but the slow rotation trays are insufficient in exchange, some areas are still short of oxygen and uneven in temperature difference; the soft tools are time-consuming and labor-consuming, and it is difficult to ensure that each soybean is uniformly stirred.

Description

Technical Field

[0001] This invention relates to the field of fermentation tank technology, specifically to a natto fermentation tank that ensures uniform fermentation. Background Technology

[0002] A uniformly fermented natto fermentation tank refers to a fermentation device that is designed, structured, and functional to ensure uniform temperature, humidity, oxygen supply, and microbial growth environment during the natto fermentation process.

[0003] For example, a seed fermentation tank for natto production, disclosed in CN207452131U, can achieve the following by setting a sampling hole on one side of the tank body and installing a sampling device inside the sampling hole, and setting a sampling chamber below the sampling hole, so as to prevent bacteria in the air from entering the tank body when sampling the seeds, thereby affecting the seed fermentation function. However, existing natto fermentation tanks still have some shortcomings.

[0004] Some existing fermenters lack internal partitioning or flow-guiding structures, resulting in excessively thick layers of soybeans. The bottom layer of soybeans, compressed, suffers from insufficient oxygen circulation, leading to decreased activity of Bacillus natto (an aerobic bacterium), prolonged fermentation time, and increased susceptibility to anaerobic bacteria growth, resulting in off-flavors and spoilage. Furthermore, during the mid-fermentation stage (1-2 times as needed), gentle turning or repositioning is necessary. Some fermenters use slow tray rotation or soft tools to gently separate the soybeans, aiming to exchange positions between layers to ensure uniform oxygen and temperature and prevent localized oxygen deficiency. However, slow tray rotation limits the range of movement and the degree of exchange, making it difficult to achieve sufficient positional exchange in a short time, resulting in persistent oxygen deficiency and uneven temperature in some areas. Gently separating the soybeans with soft tools requires significant time and effort from the operator, and it's difficult to ensure that every soybean is evenly turned, easily leading to some soybeans being over-turned while others are under-turned.

[0005] To address the aforementioned issues, there is an urgent need for innovative designs based on the existing natto fermentation tanks that ensure uniform fermentation. Summary of the Invention

[0006] This invention addresses the problem of overly simplistic solutions in existing technologies by providing a significantly different approach. Specifically, the invention aims to provide a uniformly fermenting natto fermentation tank, resolving issues raised in the background where some fermentation tanks lack internal partitioning or flow guidance structures, resulting in excessively thick soybean buildup, insufficient oxygen due to pressure on the bottom layer, decreased natto bacteria activity, prolonged fermentation, and easy growth of anaerobic bacteria leading to off-flavors and spoilage. During the mid-fermentation stage, gentle turning or repositioning is required 1-2 times. Some tanks use slow-rotating trays or soft tools to disperse the soybeans, allowing for layer exchange. However, slow-rotating trays do not provide sufficient exchange, leaving some areas still oxygen-deficient and with uneven temperature. Using soft tools is time-consuming and laborious, and it is difficult to ensure even stirring of each soybean.

[0007] To achieve the above objectives, the present invention provides the following technical solution: a natto fermentation tank with uniform fermentation, comprising a tank body, a feed inlet opened at the top of the tank body, a base fixedly connected to the top of the tank body, a discharge outlet fixedly connected to the bottom of the tank body, and a support frame disposed on the outer wall of the tank body for supporting the tank body. The tank body also includes a first feed wheel rotatably disposed on the base. Guide rods are arranged at equal angles inside the tank; The first connecting block is slidably sleeved on the guide rod and placed at the bottom of the tank; The second connecting block is slidably sleeved on the guide rod and is adapted to be inserted into the bottom of the first connecting block; The limiting rods are specifically two rods that are symmetrically distributed to form a limiting groove, and each pair of rods forms a group and is arranged at equal angles inside the tank. A soybean replacement assembly that is rotatably mounted on the outer walls of the first connecting block and the second connecting block and is driven upward by a rope to exchange the position of soybeans from bottom to top; A rope drive assembly, wound on the first feed reel, is used to drive the soybean replacement assembly to rise and replace the upper and lower layers of soybeans. The soybean replacement component includes a first counterweight plate and a second counterweight plate that are rotatably disposed at equal angles on the outer walls of the first connecting block and the second connecting block. Each of the first and second counterweight plates is provided with a rectangular block, which is slidably disposed in a limiting groove. The rope drive assembly includes a first traction rope wound on a first pay-off reel, a second pay-off reel disposed on a second connecting block, and a second traction rope wound on the second pay-off reel. The end of the first traction rope is fixedly connected to the top of the first connecting block, and the end of the second traction rope is fixedly connected to the bottom of the first connecting block.

[0008] Preferably, the soybean replacement assembly further includes a rotating shaft fixedly connected to one end of the rectangular block, one end of the rotating shaft being rotatably connected to the outer wall of the first connecting block and the second connecting block, and a spiral spring being provided on the rotating shaft.

[0009] Preferably, the top of the second connecting block is provided with a placement groove, and the second wire feeding wheel is rotatably disposed in the placement groove.

[0010] Preferably, both the first and second counterweight plates are provided with flow channels for oxygen circulation.

[0011] Preferably, a rotational distance is provided between each of the first and second counterweight plates to allow the first and second counterweight plates to rotate.

[0012] Preferably, an extension rod is fixedly connected at the center of the limiting rod, and the extension rods are symmetrically distributed to form an active cavity for the rectangular block to be driven to rotate by the rotation axis.

[0013] Preferably, a discharge handle is rotatably provided on one side of the discharge port for opening and closing the discharge port.

[0014] Preferably, a gear is rotatably provided on one side of the base, and the gear is connected to one end of the first wire feeding wheel. A servo motor is provided on the other side of the base, and the output end of the servo motor is connected to the other end of the first wire feeding wheel.

[0015] Preferably, a pawl is rotatably provided on the bottom of one side of the base for the gear to rotate in one direction, and the pawl meshes with the gear.

[0016] Preferably, the first wire feeding reel is rotatably provided with a limiting claw to prevent the first wire feeding reel from rotating in the opposite direction.

[0017] Compared with the prior art, the beneficial effects of the present invention are: As fermentation progresses into the middle stage, the first traction rope pulls the first connecting block vertically upwards along the guide rod towards the top of the tank. At this time, the first counterweight plate on the outer wall of the first connecting block is positioned within the limiting groove of the limiting rod via a rectangular block. The rectangular block, constrained by the limiting groove, keeps the first counterweight plate horizontal as it rises. During this ascent, due to the inverted conical shape of the tank, the soybeans will slightly shift and fall off as the distance between the first counterweight plate and the inner wall of the tank changes (the counterweight plate initially rests at the bottom of the tank; during ascent, it replaces the soybeans at the bottom with those at the top, while excess soybeans roll down the inclined inner wall of the tank to the sides, creating a soybean replacement process). Before entering the later stage of fermentation, the first unwinding reel continues to wind the first traction rope, and the second traction rope pulls the second connecting block, causing the second counterweight plate to begin moving upwards. Simultaneously, the first counterweight plate continues to move upward and disengage from the active cavity (after the soybeans on the first counterweight plate have been tilted, the spiral spring on the rotating shaft resets the first counterweight plate to its initial horizontal position so that it can disengage from the active cavity and re-enter the rectangular limiting groove). Meanwhile, the second counterweight plate continues to move, and the rectangular block on it enters the active cavity, repeating the soybean position replacement work of the first counterweight plate. That is, the second counterweight plate rotates around the rotating shaft, and the soybeans placed on it tilt the second counterweight plate due to their weight, causing the soybeans to tilt onto the top layer of soybeans, forming the second replacement state. After the second replacement state is completed, the soybeans that have undergone two position replacements achieve uniform coverage of oxygen and temperature. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the fermenter of the present invention.

[0019] Figure 2This is a schematic diagram of the internal structure of the fermenter of the present invention.

[0020] Figure 3 This is a diagram showing the state of natto replacement inside the fermentation tank of the present invention.

[0021] Figure 4 This is a diagram showing the state of natto falling off inside the fermentation tank of this invention.

[0022] Figure 5 This is a diagram showing the state of natto falling off from another angle inside the fermentation tank of the present invention.

[0023] Figure 6 This is a schematic diagram of the counterweight plate structure of the present invention.

[0024] Figure 7 for Figure 2 An enlarged schematic diagram of the structure at point A.

[0025] Figure 8 for Figure 6 Enlarged schematic diagram of the structure at point B.

[0026] In the diagram: 1. Tank body; 2. Inlet; 3. Base; 4. First feed reel; 5. Outlet; 6. Outlet handle; 7. Guide rod; 8. First traction rope; 9. First connecting block; 10. First counterweight plate; 11. Second connecting block; 12. Placement slot; 13. Second feed reel; 14. Second traction rope; 15. Limiting rod; 1501. Movable cavity; 16. Second counterweight plate; 17. Rectangular block; 18. Rotating shaft; 19. Spiral spring. Detailed Implementation

[0027] 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.

[0028] Please see Figures 1 to 8 The present invention provides a technical solution: a natto fermentation tank with uniform fermentation, including a tank body 1, a feed inlet 2 opened on the top of the tank body 1, a base 3 fixedly connected to the top of the tank body 1, a discharge outlet 5 fixedly connected to the bottom of the tank body 1, and a support frame set on the outer wall of the tank body 1 for supporting the tank body 1. The tank body 1 also includes a first feed wheel 4 rotatably set on the base 3. Guide rods 7 are arranged at equal angles inside the tank body 1; The first connecting block 9 is slidably sleeved on the guide rod 7 and placed at the bottom of the tank body 1; The second connecting block 11 is slidably sleeved on the guide rod 7 and is adapted to be inserted into the bottom of the first connecting block 9; The limiting rod 15 consists of two rods symmetrically distributed to form a limiting groove, and each pair of rods forms a group and is arranged at equal angles inside the tank body 1. A soybean replacement assembly that is rotatably mounted on the outer walls of the first connecting block 9 and the second connecting block 11 and is driven upward by a rope to exchange the position of soybeans from bottom to top; A rope drive assembly, wound on the first feed reel 4, is used to drive the soybean replacement assembly to rise and replace the upper and lower layers of soybeans. The soybean replacement assembly includes a first counterweight plate 10 and a second counterweight plate 16 that are rotatably disposed at equal angles on the outer walls of the first connecting block 9 and the second connecting block 11. Each of the first counterweight plate 10 and the second counterweight plate 16 is provided with a rectangular block 17, which is slidably disposed in a limiting groove. The rope drive assembly includes a first traction rope 8 wound on a first feed reel 4, a second feed reel 13 disposed on a second connecting block 11, and a second traction rope 14 wound on the second feed reel 13. The end of the first traction rope 8 is fixedly connected to the top of the first connecting block 9, and the end of the second traction rope 14 is fixedly connected to the bottom of the first connecting block 9.

[0029] In this embodiment, soybeans inoculated with Bacillus natto are poured into tank 1 through inlet 2, allowing them to stand still in tank 1 for initial static fermentation. The fermentation time is 12-24 hours. When fermentation enters the middle stage, the first unwinding wheel 4 on the base 3 begins to wind up the first traction rope 8. The first traction rope 8 pulls the first connecting block 9 to move vertically towards the top of tank 1 along the guide rod 7. At this time, the first counterweight plate 10 on the outer wall of the first connecting block 9 is positioned in the limiting groove of the limiting rod 15 through the rectangular block 17, which keeps the first counterweight plate 10 in a horizontal state as it rises. During the ascent, due to the inverted conical shape of the tank 1, the soybeans will be slightly moved and fall off as the distance between the first counterweight plate 10 and the inner wall of the tank 1 changes (it should be noted that the counterweight plate is initially placed at the bottom of the tank 1; during the ascent, it will replace the soybeans at the bottom to the top, and the excess soybeans will roll down along the inclined inner wall of the tank 1 to both sides, forming a soybean replacement state). When the first counterweight plate 10 moves to the center of the limiting rod 15 (i.e., the center of the tank 1), the rotating cavity set at the center of the limiting rod 15 begins to function (it should be noted that the limiting groove is initially close to the rectangular block 17, so that the first counterweight plate 10 can only remain horizontal; after entering the rotating cavity, it will release the restriction on the rectangular block 17). Then, the first counterweight plate 10 begins to rotate (as Figure 2 and Figure 8As shown, the rectangular block 17 and the rotating shaft are both located at the eccentric shaft of the counterweight plate. The soybeans placed on the first counterweight plate 10 tilt due to their accumulated weight, and the soybeans fall back onto the top layer of the replaced soybeans, thus completing the first replacement state of the soybeans. Before entering the later stage of fermentation, the second counterweight plate 16 begins to move upward under the pull of the second traction rope 14. At the same time, the first counterweight plate 10 continues to be pulled upward and disengages from the rotating cavity (it should be noted that after the soybeans on the first counterweight plate 10 have tilted, the first counterweight plate 10 is reset to its initial horizontal position by a return spring so that it can disengage from the rotating cavity and re-enter the rectangular limiting groove). The second counterweight plate 16 continues to move, and the rectangular block 17 on it enters the rotating cavity, repeating the soybean position replacement work of the first counterweight plate 10, forming the second replacement state. (It should be noted that during the initial rise of the first counterweight plate 10, the second traction rope 14 wound on the second feed reel 13 begins to drive the second feed reel 13 to rotate and gradually extend and straighten until the first counterweight plate 10 enters the rotating cavity, at which point the second traction rope 14 is fully straightened, preparing for the subsequent second soybean replacement work.) After the second replacement state is completed, the soybeans, having undergone two position replacements, achieve uniform coverage of oxygen and temperature, entering the final late stage of fermentation (i.e., the maturation stage). When the soybeans are completely fermented, the discharge port 5 is opened to remove the matured natto. (It should be noted that the second feed reel 13 is equipped with a winding spring for the second feed reel 13 to reset and rewind the second traction rope 14.)

[0030] The soybean replacement assembly also includes a rotating shaft 18 fixedly connected to one end of the rectangular block 17. One end of the rotating shaft 18 is rotatably connected to the outer wall of the first connecting block 9 and the second connecting block 11. A spiral spring 19 is provided on the rotating shaft 18.

[0031] In this embodiment, the rotating shaft is the rotating shaft 18, and the return spring is the spiral spring 19. The rotating shaft 18 allows the first counterweight plate 10 and the second counterweight plate 16 to rotate about the rotating shaft 18 after entering the rotating cavity due to the weight generated by the soybeans on the counterweight plates. The spiral spring 19 then resets the counterweight plates to their initial horizontal position after the soybeans have tilted.

[0032] The top of the second connecting block 11 is provided with a placement groove 12, and the second wire feeding wheel 13 is rotatably disposed in the placement groove 12.

[0033] In this embodiment, the placement groove 12 is used to place the second pay-off reel 13, and the two ends of the second pay-off reel 13 are rotatably connected to the inner walls of the two ends of the placement groove 12, and the retractable placement can better allow the second traction rope 14 to be wound around the second pay-off reel 13, improving the retractability of the second pay-off reel 13 and the second traction rope 14 as well as the space utilization rate. Secondly, the radius of the second connecting block 11 is smaller than that of the first connecting block 9, so that the first connecting block 9 in the initial state can directly cover the second connecting block 11.

[0034] Both the first counterweight plate 10 and the second counterweight plate 16 are provided with flow channels for oxygen circulation.

[0035] In this embodiment, the opening of the flow channel allows oxygen to pass through the flow channel more smoothly and come into full contact with the soybeans during the soybean displacement operation, thereby effectively improving the coverage of oxygen on the soybeans during the displacement process.

[0036] A rotational distance is provided between each first counterweight plate 10 and second counterweight plate 16 to allow the first counterweight plate 10 and second counterweight plate 16 to rotate.

[0037] In this embodiment, the rotational spacing between each counterweight plate provides space for the rotation of the first counterweight plate 10 and the second counterweight plate 16, effectively preventing the counterweight plates from getting stuck during rotation.

[0038] An extension rod is fixedly connected to the center of the limiting rod 15. The extension rods are symmetrically distributed to form an active cavity 1501 for the rectangular block 17 to be driven to rotate by the rotating shaft 18.

[0039] In this embodiment, an extension rod is fixedly connected to the central position of the limiting rod 15. These extension rods are symmetrically distributed, thus forming a movable cavity 1501 for the rectangular block 17 to rotate under the drive of the rotating shaft 18. This movable cavity 1501 is the rotating cavity mentioned above. The function of the movable cavity 1501 is to release the limiting groove from the rectangular block 17. Once the limiting is released, the counterweight plate is no longer in a horizontal state. At this time, the soybeans placed on the counterweight plate will tilt due to their own weight, and then tip over onto the soybeans on the top layer after the replacement is completed.

[0040] A discharge handle 6 is rotatably provided on one side of the discharge port 5 to open and close the discharge port 5.

[0041] In this embodiment, when the soybeans have fermented and matured into natto, and the counterweight plates are all placed on the top of the tank 1 (i.e. above the top layer of soybeans), the matured natto can be taken out by turning the discharge handle 6 to open the discharge port 5.

[0042] A gear is rotatably mounted on one side of the base 3, and the gear is connected to one end of the first wire feeding wheel 4. A servo motor is mounted on the other side of the base 3, and the output end of the servo motor is connected to the other end of the first wire feeding wheel 4.

[0043] The bottom of one side of the base 3 is equipped with a pawl that allows the gear to rotate in one direction, and the pawl meshes with the gear.

[0044] The first feed reel 4 is equipped with a limiting claw that locks the first feed reel 4 to rotate in the opposite direction.

[0045] In this embodiment, the pawl functions to enable unidirectional rotation of the gear. It allows the gear to rotate freely in a preset positive direction (such as clockwise). When the gear tends to rotate in the opposite direction (such as counterclockwise), the pawl engages with the gear's ratchet teeth, preventing its rotation. This ensures that power transmission occurs only in a single direction. Unlike the pawl, the limiting pawl primarily prevents the first wire-feeding reel 4 from rotating in the opposite direction under specific circumstances (such as malfunction due to external interference). Specifically, as... Figure 3 As shown, the limiting pawl does not engage with the ratchet teeth of the gear, but rather directly contacts the disc at one end of the first feed reel 4. This disc has a limiting block that contacts the limiting pawl. When the first traction rope 8 needs to be released, the first counterweight plate 10 decreases due to its own weight, causing the entire first feed reel 4 to tend to rotate in the opposite direction. At this time, the limiting pawl functions to prevent the first counterweight plate 10 from descending before the natto is discharged, thus ensuring that operations related to the first feed reel 4 (such as the raising and lowering of the traction rope) can be performed stably and accurately, maintaining the normal operation and working accuracy of the device.

[0046] Working principle: When using this uniformly fermented natto fermentation tank, first pour soybeans inoculated with natto bacteria into tank 1 through inlet 2, and let the soybeans stand in tank 1 for preliminary static fermentation. The fermentation time is 12-24 hours.

[0047] When fermentation enters the middle stage, the servo motor on the other side of the base 3 is started. The output of the servo motor drives the first unwinding wheel 4 to rotate and begin winding the first traction rope 8. The first traction rope 8 pulls the first connecting block 9 to move vertically towards the top of the tank 1 along the guide rod 7. At this time, the first counterweight plate 10 on the outer wall of the first connecting block 9 is set in the limiting groove of the limiting rod 15 through the rectangular block 17. The rectangular block 17 is restricted by the limiting groove, so that the first counterweight plate 10 is kept in a horizontal state and rises. During the rising process, since the tank 1 is set in an inverted cone shape, the soybeans will be slightly moved and fall off as the distance between the first counterweight plate 10 and the inner wall of the tank 1 changes (the counterweight plate is initially placed at the bottom of the tank 1. During the rising process, it will replace the soybeans at the bottom to the top. The excess soybeans will roll down along the inclined inner wall of the tank 1 to both sides, forming a soybean replacement state). When the first counterweight plate 10 moves to the center of the limiting rod 15 (i.e. the center of the tank 1), the movable cavity 1501 formed by the symmetrical distribution of the extension rods fixedly connected at the center of the limiting rod 15 begins to play its role (the limiting groove is initially close to the rectangular block 17, so that the first counterweight plate 10 can only keep in a horizontal state. After entering the movable cavity 1501, it will release the restriction on the rectangular block 17). Subsequently, the rotating shaft 18, which is fixedly connected to one end of the rectangular block 17, rotates around the point where it rotates with the outer wall of the first connecting block 9, causing the first counterweight plate 10 to start rotating (both the rectangular block 17 and the rotating shaft 18 are located at the eccentric axis of the counterweight plate). The soybeans placed on the first counterweight plate 10 tilt due to the weight of the accumulated soybeans, and the soybeans fall back onto the top layer of the replaced soybeans, thus completing the first replacement state of the soybeans.

[0048] During the initial ascent of the first counterweight plate 10, the second traction rope 14, wound around the second feed reel 13, begins to drive the second feed reel 13 to rotate and gradually extend and straighten (the second feed reel 13 is rotatably mounted in the placement groove 12 at the top of the second connecting block 11, and its two ends are rotatably connected to the inner walls of the two ends of the placement groove 12). The second traction rope 14 is fully straightened after the first counterweight plate 10 enters the movable cavity 1501, preparing for the subsequent second soybean replacement operation.

[0049] Before entering the later stage of fermentation, the first feed reel 4 continues to wind the first traction rope 8, and the second traction rope 14 pulls the second connecting block 11, causing the second counterweight plate 16 to begin to move upward. At the same time, the first counterweight plate 10 continues to be pulled upward and disengages from the movable cavity 1501 (after the soybeans on the first counterweight plate 10 have been tilted, the spiral spring 19 on the rotating shaft 18 resets the first counterweight plate 10 to its initial horizontal position so that it can disengage from the movable cavity 1501 and re-enter the rectangular limiting groove), while the second counterweight plate 16 continues to move, and the rectangular block 17 on it enters the movable cavity 1501, repeating the soybean position replacement work of the first counterweight plate 10, that is, the second counterweight plate 16 rotates around the rotating shaft 18 as the axis, and the soybeans placed on it tilt the second counterweight plate 16 due to their weight, and the soybeans tilt onto the top layer of soybeans, forming the second replacement state.

[0050] Once the soybeans have fully fermented and the counterweight plates are all placed on top of the tank 1 (i.e. above the top layer of soybeans), the discharge port 5 can be opened by rotating the discharge handle 6 on one side of the discharge port 5, and the cooked natto can be taken out (the second feed reel 13 is equipped with a winding spring for the second feed reel 13 to reset and wind up the second traction rope 14 for the next use).

[0051] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A uniformly fermented natto fermentation tank, comprising a tank body (1), an inlet (2) opened at the top of the tank body (1), a base (3) fixedly connected to the top of the tank body (1), an outlet (5) fixedly connected to the bottom of the tank body (1), and a support frame disposed on the outer wall of the tank body (1) for supporting the tank body (1), characterized in that: The tank (1) also includes a first wire feeding wheel (4) that is rotatably mounted on the base (3); Guide rods (7) are arranged at equal angles inside the tank (1); The first connecting block (9) is slidably sleeved on the guide rod (7) and placed at the bottom of the tank (1); The second connecting block (11) is slidably sleeved on the guide rod (7) and is adapted to be inserted into the bottom of the first connecting block (9); The limiting rod (15) consists of two rods that are symmetrically distributed to form a limiting groove, and each pair of rods forms a group and is arranged at equal angles inside the tank (1). A soybean replacement assembly that rotates on the outer walls of the first connecting block (9) and the second connecting block (11) and rises based on a rope drive to exchange the position of soybeans from bottom to top; A rope drive assembly is wound on the first feed reel (4) to drive the soybean replacement assembly to rise and replace the upper and lower soybeans. The soybean replacement assembly includes a first counterweight plate (10) and a second counterweight plate (16) that are rotatably disposed at equal angles on the outer walls of the first connecting block (9) and the second connecting block (11). Each of the first counterweight plate (10) and the second counterweight plate (16) is provided with a rectangular block (17), which is slidably disposed in the limiting groove. The rope drive assembly includes a first traction rope (8) wound on a first feed reel (4), a second feed reel (13) disposed on a second connecting block (11), and a second traction rope (14) wound on the second feed reel (13). The end of the first traction rope (8) is fixedly connected to the top of the first connecting block (9), and the end of the second traction rope (14) is fixedly connected to the bottom of the first connecting block (9).

2. The natto fermentation tank with uniform fermentation according to claim 1, characterized in that: The soybean replacement assembly also includes a rotating shaft (18) fixedly connected to one end of the rectangular block (17). One end of the rotating shaft (18) is rotatably connected to the outer wall of the first connecting block (9) and the second connecting block (11). A spiral spring (19) is provided on the rotating shaft (18).

3. The natto fermentation tank with uniform fermentation according to claim 1, characterized in that: The top of the second connecting block (11) is provided with a placement groove (12), and the second wire feeding wheel (13) is rotatably disposed in the placement groove (12).

4. The natto fermentation tank with uniform fermentation according to claim 1, characterized in that: Both the first counterweight plate (10) and the second counterweight plate (16) are provided with flow channels for oxygen circulation.

5. The natto fermentation tank with uniform fermentation according to claim 4, characterized in that: Each of the first counterweight plate (10) and the second counterweight plate (16) is provided with a rotational distance for the first counterweight plate (10) and the second counterweight plate (16) to rotate.

6. The natto fermentation tank with uniform fermentation according to claim 1, characterized in that: An extension rod is fixedly connected at the center of the limiting rod (15), and the extension rods are symmetrically distributed to form an active cavity (1501) for the rectangular block (17) to be driven to rotate by the rotating shaft (18).

7. The natto fermentation tank with uniform fermentation according to claim 1, characterized in that: A discharge handle (6) is rotatably provided on one side of the discharge port (5) for opening and closing the discharge port (5).

8. The natto fermentation tank with uniform fermentation according to claim 1, characterized in that: A gear is rotatably provided on one side of the base (3), and the gear is connected to one end of the first wire feeding wheel (4). A servo motor is provided on the other side of the base (3), and the output end of the servo motor is connected to the other end of the first wire feeding wheel (4).

9. A uniformly fermented natto fermentation tank according to claim 8, characterized in that: The bottom of one side of the base (3) is rotatably provided with a pawl for the gear to rotate in one direction, and the pawl meshes with the gear.

10. A uniformly fermented natto fermentation tank according to claim 8, characterized in that: The first wire feeding wheel (4) is provided with a limiting claw that locks the first wire feeding wheel (4) to rotate in the opposite direction.

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