Solid-liquid separation device for natto preparation and high-kinase natto preparation method

Abstract

The invention discloses a natto preparation solid-liquid separation device and a high kinase natto preparation method, and relates to the field of natto production.The natto preparation solid-liquid separation device comprises a fermentation vat, the fermentation vat comprises a lower vat body and an upper vat body, and a sealing ring is arranged at the joint of the lower vat body and the upper vat body; the stirring part comprises a rotary center rod arranged on the upper barrel body, stirring blades arranged at the bottom end of the rotary center rod, a mounting rod movably connected to the bottom of the rotary center rod, a rotating plate arranged on the mounting rod and a stirring rod arranged on the lower surface of the rotating plate; the pressing piece comprises a rotating sleeve arranged on the rotary center rod, a lifting sleeve arranged on the rotating sleeve and a pressing plate arranged at the bottom end of the lifting sleeve; according to the solid-liquid separation device for natto preparation, by arranging the stirring piece, raw materials can be stirred during fermentation, so that the raw materials and a mixed solution of bacillus natto are fully mixed, the raw materials can be pressed after mixing, redundant liquid is pressed out, a better fermentation environment can be obtained for natto, and the situation that a large amount of water influences natto fermentation is avoided.

Description

Technical Field

[0001] The invention relates to a natto production technology, and in particular to a natto preparation solid-liquid separation device and a high-kinase natto preparation method. Background Art

[0002] Natto is a traditional fermented soybean food that originated in China and has been widely developed and consumed in Japan. The fermentation process of natto mainly relies on Bacillus subtilis, a microorganism that produces a variety of enzymes during the fermentation process, such as nattokinase, protease, amylase, etc. These enzymes not only help to decompose macromolecular substances in soybeans and improve their digestion and absorption rate, but also give natto unique health benefits. Nattokinase is a special serine protease that has attracted widespread attention due to its significant thrombolytic effect. Nattokinase can help dissolve blood clots, lower blood pressure, prevent osteoporosis and other health functions. Other active substances in natto, such as soy isoflavones and vitamin K2, are also beneficial to human health.

[0003] Traditional natto fermentation technology usually involves inoculating boiled beans with natto bacteria and then fermenting them naturally under constant temperature. However, this process has many limitations. Usually, when fermenting natto, the bean raw materials are mixed with natto bacteria powder, and the bean powder is attached to the surface of the bean raw materials and then fermented under constant temperature. However, since the surface of the beans is mostly smooth, the natto bacteria powder is very easy to fall off, resulting in uneven and insufficient fermentation. For this reason, some existing technologies use natto bacteria mixed in a mild liquid, and soak the natto in the mixed liquid so that the natto can be more fully mixed with the natto bacteria and fermented more fully.

[0004] However, the prior art uses a mixed liquid method for fermentation, and a large amount of water is injected during the fermentation process. The excess water during the fermentation process will affect the fermentation of natto, and may affect the viscosity and fermentation degree of natto. Summary of the invention

[0005] The purpose of the present invention is to provide a solid-liquid separation device for preparing natto and a method for preparing high-kinase natto, so as to solve the problem of excessive water content after using a mixed liquid in the prior art.

[0006] In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a natto preparation solid-liquid separation device, comprising a fermentation barrel, characterized in that the fermentation barrel comprises a lower barrel body and an upper barrel body, a sealing ring is provided at the connection between the lower barrel body and the upper barrel body, and the bottom of the lower barrel body is a fermentation chamber; the upper barrel body is rotatably connected to a stirring member, and the stirring member comprises a rotating center rod rotatably connected to the upper barrel body; the rotating center rod sleeve is provided with a clamping member, and the clamping member comprises a rotating sleeve rotatably connected to the rotating center rod and is linked with the rotating center rod, the rotating sleeve is transmission-connected to a lifting sleeve and can drive the lifting sleeve to rise or fall, and the bottom end of the lifting sleeve is fixedly connected to a pressure plate; the lower barrel body is provided with a drain outlet, and the drain outlet is located at the top of the fermentation chamber.

[0007] Furthermore, the fermentation barrel also includes a barrel cover arranged on the top of the upper barrel body, the side wall of the lower barrel body is provided with a feed port, and a sealing gasket is arranged in the sealing ring.

[0008] Furthermore, a stirring blade is provided at the bottom end of the rotating center rod, a hollow tube is fixedly connected to the bottom of the rotating center rod, a limiting through groove is provided on the tube wall of the hollow tube, a floating block is movably connected inside the hollow tube, a mounting rod is fixedly connected to the periphery of the floating block, a rotating plate is rotatably connected to the lower surface of the mounting rod, and a stirring rod is fixedly connected to the lower surface of the rotating plate.

[0009] Furthermore, the size and shape of the floating block are matched with the hollow tube, the floating block and the hollow tube are slidably matched, and the top end of the mounting rod passes through the limiting through slot and is fixedly connected with the floating block.

[0010] Furthermore, the clamping member also includes a threaded head arranged at the bottom of the rotating sleeve, the lifting sleeve is threadedly connected to the threaded head, the pressing plate is adapted to the size and shape of the lower barrel body, and a water hole is opened on the surface of the pressing plate.

[0011] Furthermore, a partition is provided on the inner wall of the upper barrel, a limit frame is provided on the lower surface of the partition, a lifting rod is provided in the limit frame, and a connecting frame is provided on the outer surface of the lifting sleeve.

[0012] Furthermore, the rotating sleeve is rotatably connected to the partition, the top end of the limit frame is fixedly connected to the partition, the lifting rod is slidably connected to the limit frame, and the connecting frame is fixedly connected to the lifting sleeve and slidably connected to the lifting rod.

[0013] Furthermore, it also includes a driving member, which includes a first bevel gear arranged on the rotating center rod, a second bevel gear arranged on the rotating sleeve, a driving gear engaged with the first bevel gear and the second bevel gear, and a driving motor connected to the driving gear.

[0014] Furthermore, the first bevel gear and the second bevel gear are symmetrically arranged, the first bevel gear and the second bevel gear are both arranged above the partition, and the driving motor is fixedly mounted on the partition.

[0015] Compared with the prior art, the solid-liquid separation device for preparing natto provided by the present invention has a pressing piece, and during fermentation, the lifting sleeve of the pressing piece descends along the rotating sleeve, thereby controlling the pressing plate to press down. When the pressing plate is pressed down, the natto in the fermentation chamber is pressed downward until the pressing plate completely passes through the drain port, so that all the excess water floats above the natto. At this time, the height of the natto in the fermentation chamber is just lower than the height of the drain port. By opening the drain port, the excess water on the top of the natto can be discharged from the drain port, thereby reducing the water content in the fermentation chamber, so that the natto can obtain a better fermentation environment, which can not only make the natto raw material more evenly mixed with the natto bacteria in the form of a mixed liquid, but also avoid the influence of a large amount of water on the natto fermentation, and the use is simple and convenient.

[0016] A method for preparing high-kinase natto comprises the following steps:

[0017] Step 1, placing soybean raw materials into a fermentation barrel;

[0018] Step 2, adding natto bacteria to start the fermentation process, and stirring the soybean material with the stirring member to promote uniform distribution of the bacteria;

[0019] Step 3, during the fermentation process, the lifting sleeve and the pressing plate of the pressing member are used to appropriately press the fermenting soybeans to optimize the fermentation environment and increase the production of kinase;

[0020] Step 4, after the fermentation is completed, the fermentation liquid is discharged through the drainage port of the device, and the obtained high kinase natto is collected.

[0021] Compared with the prior art, the present invention provides a method for preparing high-kinase natto. Through this method, when preparing natto, excess mixed liquid and fermentation liquid can be discharged, so that the natto raw material and the natto bacteria can be better mixed, a better fermentation environment can be obtained, and more kinase can be retained in the natto, thereby producing high-kinase natto. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0023] Figure 1 A schematic diagram of the overall structure provided by an embodiment of the present invention;

[0024] Figure 2An overall schematic diagram of the internal structure provided by an embodiment of the present invention;

[0025] Figure 3 A schematic diagram of the overall cross-sectional structure provided by an embodiment of the present invention;

[0026] Figure 4 A schematic front view of the internal structure provided by an embodiment of the present invention;

[0027] Figure 5 A schematic diagram of the structure of a limit frame and a lifting rod provided in an embodiment of the present invention;

[0028] Figure 6 for Figure 3 A magnified image of point A;

[0029] Figure 7 Schematic diagram of the forces acting on the rotating plate and stirring rod when stirring begins.

[0030] Description of reference numerals:

[0031] 1. Fermentation barrel; 11. Lower barrel body; 12. Upper barrel body; 13. Barrel cover; 14. Feed inlet; 15. Drain outlet; 16. Sealing ring; 17. Sealing gasket; 18. Water inlet;

[0032] 2. stirring element; 21. rotating center rod; 22. stirring blade; 23. hollow tube; 24. floating block; 25. limiting slot; 26. mounting rod; 27. rotating plate; 28. stirring rod;

[0033] 3. Pressing piece; 31. Rotating sleeve; 32. Threaded head; 33. Lifting sleeve; 34. Pressing plate; 35. Partition plate; 36. Limiting frame; 37. Lifting rod; 38. Connecting frame;

[0034] 4. Driving member; 41. First bevel gear; 42. Second bevel gear; 43. Driving gear; 44. Driving motor. DETAILED DESCRIPTION

[0035] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0036] Embodiment 1:

[0037] See also Figure 1-7A natto preparation solid-liquid separation device comprises a fermentation barrel 1, the fermentation barrel 1 comprises a lower barrel body 11 and an upper barrel body 12, a sealing ring 16 is provided at the connection between the lower barrel body 11 and the upper barrel body 12; a stirring member 2 comprises a rotating center rod 21 arranged on the upper barrel body 12, a stirring blade 22 arranged at the bottom end of the rotating center rod 21, a mounting rod 26 movably connected to the bottom of the rotating center rod 21, a rotating plate 27 arranged on the mounting rod 26, and a stirring rod 28 arranged on the lower surface of the rotating plate 27; a pressing member 3 comprises a rotating sleeve 31 arranged on the rotating center rod 21, a lifting sleeve 33 arranged on the rotating sleeve 31, and a pressing plate 34 arranged at the bottom end of the lifting sleeve 33.

[0038] The lower barrel body 11 and the upper barrel body 12 have the same diameter and can be separated. The bottom of the upper barrel body 12 is inserted into the sealing ring 16, so that the connection between the upper barrel body 12 and the lower barrel body 11 can be sealed after being installed together. The lower barrel body 11 is used to put soybeans for fermentation, and the upper barrel body 12 is used to install equipment. A barrel cover 13 is also provided on the upper barrel body 12, so that the sealing of the lower barrel body 11 can be maintained during the fermentation process, and the equipment can be maintained or filled with raw materials. The rotating center rod 21 is coaxially arranged with the fermentation barrel 1, and the stirring blade 22 is symmetrically broken line-shaped, with shovels at both ends. The rotating center rod 21 can rotate forward and reverse, so that the stirring blade 22 can stir both forward and reverse. A water hole is also provided on the stirring blade 22 for allowing liquid to pass through the stirring blade 22 during stirring. When the rotating center rod 21 rotates, it can drive the stirring blade 22 to move, and the shovel part of the stirring blade 22 fits the bottom wall of the lower barrel body 11, so that all the soybeans are shoveled up for stirring;

[0039] There are several mounting rods 26, which are arranged perpendicular to the rotating center rod 21. The rotating plate 27 is rotatably connected to the mounting rod 26 by a hinge. Each rotating plate 27 is provided with several stirring rods 28 perpendicular to the rotating plate 27. When the rotating center rod 21 rotates forward, the mounting rod 26 is driven to rotate forward. The rotation of the mounting rod 26 drives the stirring rod 28 to start stirring the soybean and the mixed liquid. Due to the resistance of the soybean and the mixed liquid, the stirring rod 28 is blocked and drives the rotating plate 27 to rotate in the opposite direction toward the mounting rod 26, so that it is closely attached to the mounting rod 26. At this time, the stirring rod 28 is vertically downward;

[0040] The rotating sleeve 31 is sleeved outside the rotating center rod 21, and the rotating sleeve 31 can rotate around the rotating center rod 21. The lifting sleeve 33 is sleeved outside the rotating sleeve 31, and the lifting sleeve 33 rotates and lifts with the rotating sleeve 31. When the rotating sleeve 31 rotates, the lifting and lowering of the lifting sleeve 33 is controlled, thereby driving the pressing plate 34 to rise and press down, pressing the soybeans, and squeezing out the liquid so that it floats above the soybeans.

[0041] The fermentation barrel 1 also includes a barrel cover 13 arranged on the top of the upper barrel body 12, a feed port 14 and a drain port 15 arranged on both sides of the lower barrel body 11, and a sealing gasket 17 arranged in the sealing ring 16. The upper barrel body 12 is closed by the sealing gasket 17. The feed port 14 is arranged below the highest position of the pressing plate 34 to prevent it from being blocked by the pressing plate 34 during feeding. The drain port 15 is arranged near the bottom of the lower barrel body 11. After the fermented soybeans are put in, the drain port 15 is on the top surface of the soybeans and can discharge the supernatant. The sealing gasket 17 adopts a soft sealing ring. When the upper barrel body 12 is inserted into the sealing ring 16, the sealing ring 16 is pressed tightly under its own weight, so as to be more airtight. A water inlet 18 is provided in the upper barrel body 12 for injecting water required for fermentation.

[0042] The stirring member 2 also includes a hollow tube 23 arranged at the bottom of the rotating center rod 21, the stirring member 2 also includes a floating block 24 arranged in the hollow tube 23, and the stirring member 2 also includes a limiting groove 25 opened on the side of the hollow tube 23. The size and shape of the hollow tube 23 are adapted to the rotating center rod 21. The hollow tube 23 is connected to the outside through the limiting groove 25, and the floating block 24 can float in the hollow tube 23 according to the liquid level.

[0043] The floating block 24 is adapted to the size and shape of the hollow tube 23, and the floating block 24 is slidably matched with the hollow tube 23. The top end of the mounting rod 26 passes through the limiting groove 25 and is fixedly connected to the floating block 24. The mounting rod 26 is adapted to the size of the limiting groove 25 and can slide up and down along the limiting groove 25. The mounting rod 26 is fixedly connected to the floating block 24, and the mounting rod 26 also prevents the floating block 24 from rotating.

[0044] Operation process: when in use, first combine the upper barrel body 12 with the lower barrel body 11, put the raw soybeans into the lower barrel body 11 through the feed port 14, and inject the mixed liquid mixed with natto bacteria through the water inlet 18 of the upper barrel body 12, then control the rotating center rod 21 to rotate forward, and the rotating center rod 21 drives the stirring blade 22 to move during rotation, so as to scoop up and stir the soybeans from the bottom, so that the soybeans and the mixed liquid are fully mixed. When the rotating center rod 21 rotates, the floating block 24 is driven to rise due to the high liquid level of the mixed liquid, and the mounting rod 26 is synchronously raised at this time. Since there is no limit between the rotating plate 27 and the mounting rod 26, the stirring rod 28 is facing obliquely downward at this time, but due to the positive rotation of the rotating center rod 21, the resistance of the soybeans and water will change the stirring rod 28 to vertically downward. At this time, the rotating plate 27 is close to the mounting rod 26, and the stirring rod 28 plays a stirring role in another direction, further mixing the soybeans with the mixed liquid;

[0045] When the rotating center rod 21 stops rotating, the stirring rod 28 becomes tilted again under the action of the buoyancy of the mixed liquid. At this time, the lifting sleeve 33 can be controlled to drive the pressure plate 34 to descend. The pressure plate 34 will first contact the mounting rod 26, and the pressure plate 34 will press the mounting rod 26 downward. As the stirring rod 28 touches the bottom, it continues to press down. The stirring rod 28 will gradually flip upward and can be parallel to the mounting rod 26 at most. The pressure plate 34 is pressed down until it can slightly press the soybeans and then stops. At this time, the pressure plate 34 is located below the drain outlet, and the fermented liquid in the lower barrel body 11 floats above the soybeans, so that the fermented liquid can be discharged through the drain outlet 15.

[0046] Embodiment 2:

[0047] See also Figure 3-5 This embodiment provides a technical solution based on the first embodiment: the clamping member 3 also includes a threaded head 32 arranged at the bottom of the rotating sleeve 31, the lifting sleeve 33 is threadedly connected to the threaded head 32, the pressing plate 34 is adapted to the size and shape of the lower barrel body 11, and a water hole is opened on the surface of the pressing plate 34.

[0048] Specifically, the threaded head 32 is only arranged at the bottom of the rotating sleeve 31. When the lifting sleeve 33 is at the top end of the rotating sleeve 31, the top end of the lifting sleeve 33 contacts the partition 35, and the bottom end of the lifting sleeve 33 does not contact the threaded head 32. The inner wall of the lifting sleeve 33 is provided with an internal thread that cooperates with the threaded head 32. When the rotating sleeve 31 rotates forward, the lifting sleeve 33 engages with the threaded head 32 and starts to descend. When the rotating sleeve 31 reverses, the lifting sleeve 33 gradually rises until it is completely separated from the threaded head 32, and at this time remains above the threaded head 32.

[0049] A partition 35 is also provided on the inner wall of the upper barrel body 12, and a limit frame 36 is provided on the lower surface of the partition 35. A lifting rod 37 is provided in the limit frame 36, and a connecting frame 38 is provided on the outer surface of the lifting sleeve 33. The partition 35 is fixedly connected to the upper barrel body 12 on the inner wall of the upper barrel body 12, closing the upper barrel body 12 and dividing it into two parts, the limit frame 36 and the connecting frame 38 are open rectangles, and the lifting rod 37 is an I-shaped rod body. The limit frame 36 and the connecting frame 38 are fitted and symmetrically arranged, and the top of the limit frame 36 is fixedly connected to the partition 35, and the bottom end of the limit frame 36 has a hole for the lifting rod 37 to be lowered, and the bottom end of the connecting frame 38 is closed to prevent the lifting rod 37 from falling off.

[0050] The rotating sleeve 31 is rotatably connected to the partition 35 , the top of the limit frame 36 is fixedly connected to the partition 35 , the lifting rod 37 is slidably connected to the limit frame 36 , and the connecting frame 38 is fixedly connected to the lifting sleeve 33 and slidably connected to the lifting rod 37 .

[0051] The lifting rod 37 is in the shape of an I, and is divided into two parallel horizontal plates and a vertical plate vertically arranged in the middle. The limiting frame 36 and the connecting frame 38 are respectively connected to a horizontal plate that covers the lifting rod 37, and the openings of the limiting frame 36 and the connecting frame 38 clamp the vertical plate together.

[0052] It also includes a driving member 4, which includes a first bevel gear 41 arranged on the rotating center rod 21, a second bevel gear 42 arranged on the rotating sleeve 31, a driving gear 43 kneaded with the first bevel gear 41 and the second bevel gear 42, and a driving motor 44 connected to the driving gear 43.

[0053] The driving motor 44 is connected to the driving gear 43, and the driving gear 43 drives the first bevel gear 41 and the second bevel gear 42 at the same time. The rotation directions of the first bevel gear 41 and the second bevel gear 42 are opposite. The driving motor 44 can control the forward and reverse rotation of the driving gear 43, thereby controlling the forward and reverse rotation of the rotating center rod 21 and the rotating sleeve 31.

[0054] The first bevel gear 41 and the second bevel gear 42 are symmetrically arranged, and the first bevel gear 41 and the second bevel gear 42 are both arranged above the partition 35. The drive motor 44 is fixedly installed on the partition 35. The top end of the rotating center rod 21 is rotatably connected to the barrel cover 13, and the top end of the rotating sleeve 31 is rotatably connected to the partition 35. The rotating center rod 21 and the rotating sleeve 31 have opposite rotation directions.

[0055] Working principle: when in use, the driving motor 44 controls the driving gear 43 to rotate, and the driving gear 43 drives the rotating center rod 21 to rotate forwardly through the first bevel gear 41. At this time, the driving gear 43 drives the rotating sleeve 31 to rotate in the opposite direction through the second bevel gear 42. When the rotating center rod 21 rotates forwardly, the stirring blade 22 and the stirring rod 28 are used to stir the soybeans and the mixed liquid in the lower barrel 11 to make them mixed more fully. At the same time, due to the reversal of the rotating sleeve 31, the lifting sleeve 33 is restricted by the lifting rods 37 and the limit frame 36 to rotate, and can only be lifted and lowered along the axis direction of the rotating sleeve 31. Since the thread directions of the threaded head 32 are opposite, the threaded head 32 will keep the lifting sleeve 33 at the upper part of the rotating sleeve 31, and the pressing plate 34 is in the highest position;

[0056] When the stirring is completed and the upper layer of liquid needs to be discharged, the driving motor 44 is controlled to reverse. At this time, the stirring blade 22 can still scoop up the soybeans on the bottom wall of the lower barrel 11, but because the rotation direction of the mounting rod 26 is opposite, the stirring rod 28 will gradually rotate and rise under the resistance of the water and the soybeans. At the same time, since the rotating center rod 21 is reversed, but the rotating sleeve 31 becomes forward, the lifting sleeve 33 can be connected with the threaded head 32 at this time. Due to the restrictions of the limit frame 36, the lifting rod 37 and the connecting frame 38, the lifting sleeve 33 will gradually descend, driving the pressing plate 34 to press down. When the pressing plate 34 is pressed down, the floating block 24 is pressed down synchronously until the soybeans are slightly pressed, and the liquid in the barrel is pressed out, so that it floats on the top, so that it can be discharged through the drain port 15. In addition, the device can also make the gear ratios of the first bevel gear 41, the second bevel gear 42 and the driving gear 43 different, so as to control the ratio of the stirring speed and the lifting speed.

[0057] Embodiment three:

[0058] A method for preparing high-kinase natto comprises the following steps:

[0059] Step 1, placing soybean raw materials into a fermentation tank 1;

[0060] Step 2, adding natto bacteria to start the fermentation process, and stirring the soybean material with a stirring member 2 to promote uniform distribution of the bacteria;

[0061] Step 3, during the fermentation process, the lifting sleeve 33 and the pressing plate 34 of the pressing member 3 are used to appropriately press the fermenting soybeans to optimize the fermentation environment and increase the production of kinase;

[0062] Step 4, after the fermentation is completed, the fermentation liquid is discharged through the drainage port 15 of the device, and the obtained high kinase natto is collected.

[0063] There is a scale line in the barrel, and the scale line position is the lowest drainage height of the drain port 15. When the soybean raw material is put in, it should be slightly higher than the scale line;

[0064] The natto bacteria are mixed with water or saline solution and injected into the barrel through the water inlet 18 of the upper barrel body 12. The injected amount should completely submerge the soybean raw material. After the injection is completed, the raw material is stirred by the stirring member 2 so that each soybean is fully in contact with the mixed liquid.

[0065] When fermentation begins, the pressing member 3 can press the soybeans to make them in close contact and optimize the fermentation environment. The pressing process will only last until the pressing plate 34 reaches the scale line position to prevent the soybeans from being crushed. At this time, most of the mixed liquid can be discharged to prevent affecting the production of natto.

[0066] After fermentation is completed, it is pressed again to drain the fermented liquid, leaving only the natto. The kinase is attached to the surface of the natto and will not be discharged with the fermented liquid.

[0067] The above description is only by way of illustration of certain exemplary embodiments of the present invention. It is undoubted that those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A solid-liquid separation device for preparing natto, comprising a fermentation tank (1), characterized in that: The fermentation barrel (1) comprises a lower barrel body (11) and an upper barrel body (12), a sealing ring (16) is provided at the connection between the lower barrel body (11) and the upper barrel body (12), and the bottom of the lower barrel body (11) is a fermentation chamber; The upper barrel (12) is rotatably connected to a stirring member (2), and the stirring member (2) comprises a rotating center rod (21) rotatably connected to the upper barrel (12); The rotating center rod (21) is sleeved with a clamping member (3), the clamping member (3) comprising a rotating sleeve (31) rotatably connected to the rotating center rod (21) and linked with the rotating center rod, the rotating sleeve (31) is transmission-connected to a lifting sleeve (33) and can drive the lifting sleeve to rise or fall, and the bottom end of the lifting sleeve (33) is fixedly connected to a pressing plate (34); The lower barrel body (11) is provided with a drainage port (15), and the drainage port (15) is located at the top of the fermentation chamber.

2. The solid-liquid separation device for preparing natto according to claim 1, characterized in that: The fermentation barrel (1) further comprises a barrel cover (13) arranged on the top of the upper barrel body (12); a feed port (14) is arranged on the side wall of the lower barrel body (11); and a sealing gasket (17) is arranged inside the sealing ring (16).

3. The solid-liquid separation device for preparing natto according to claim 2, characterized in that: A stirring blade (22) is arranged at the bottom end of the rotating center rod (21); a hollow tube (23) is fixedly connected to the bottom of the rotating center rod (21); a limiting through groove (25) is provided on the tube wall of the hollow tube (23); a floating block (24) is movably connected inside the hollow tube (23); a mounting rod (26) is fixedly connected to the circumference of the floating block (24); a rotating plate (27) is rotatably connected to the lower surface of the mounting rod (26); and a stirring rod (28) is fixedly connected to the lower surface of the rotating plate (27).

4. The solid-liquid separation device for preparing natto according to claim 3, characterized in that: The size and shape of the floating block (24) and the hollow tube (23) are matched, the floating block (24) and the hollow tube (23) are slidably matched, and the top end of the mounting rod (26) passes through the limiting slot (25) and is fixedly connected to the floating block (24).

5. The solid-liquid separation device for preparing natto according to claim 4, characterized in that: The clamping member (3) further comprises a threaded head (32) arranged at the bottom of the rotating sleeve (31); the lifting sleeve (33) is threadedly connected to the threaded head (32); the pressing plate (34) is adapted to the size and shape of the lower barrel (11); and a water hole is provided on the surface of the pressing plate (34).

6. The solid-liquid separation device for preparing natto according to claim 5, characterized in that: The inner wall of the upper barrel body (12) is also provided with a partition (35), the lower surface of the partition (35) is provided with a limit frame (36), a lifting rod (37) is provided in the limit frame (36), and the outer surface of the lifting sleeve (33) is provided with a connecting frame (38).

7. The solid-liquid separation device for preparing natto according to claim 6, characterized in that: The rotating sleeve (31) is rotatably connected to the partition (35), the top end of the limiting frame (36) is fixedly connected to the partition (35), the lifting rod (37) is slidably connected to the limiting frame (36), and the connecting frame (38) is fixedly connected to the lifting sleeve (33) and slidably connected to the lifting rod (37).

8. The solid-liquid separation device for preparing natto according to claim 7, characterized in that: The invention also comprises a driving member (4), wherein the driving member (4) comprises a first bevel gear (41) arranged on the rotating center rod (21), a second bevel gear (42) arranged on the rotating sleeve (31), a driving gear (43) engaged with the first bevel gear (41) and the second bevel gear (42), and a driving motor (44) connected to the driving gear (43).

9. The solid-liquid separation device for preparing natto according to claim 8, characterized in that: The first bevel gear (41) and the second bevel gear (42) are symmetrically arranged; the first bevel gear (41) and the second bevel gear (42) are both arranged above the partition (35); and the drive motor (44) is fixedly mounted on the partition (35).

10. A method for preparing high kinase natto, using a natto preparation solid-liquid separation device according to any one of claims 1 to 9, characterized in that: The following steps are included: Step 1, placing soybean raw materials into a fermentation tank (1); Step 2, adding natto bacteria to start the fermentation process, and at the same time using the stirring element (2) to stir the soybean material to promote uniform distribution of the bacteria; Step 3, during the fermentation process, the lifting sleeve (33) and the pressing plate (34) of the pressing member (3) are used to appropriately press the fermenting soybeans to optimize the fermentation environment and increase the production of kinase; Step 4, after the fermentation is completed, the fermentation liquid is discharged through the drainage port (15) of the device, and the obtained high kinase natto is collected.

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