Fermentation tank for preparing Bacillus subtilis powder

Abstract

The present invention relates to the technical field of Bacillus subtilis fermentation, and discloses a fermentation tank for preparing Bacillus subtilis powder, including a fermentation tank and a top cover installed on the top thereof, and also including: a partition installed on the inner wall of the top cover, and a stirring shaft assembly is vertically installed at the center of the partition, and multiple groups of stirring members are installed on the outer wall of the stirring shaft assembly; a driving assembly, the driving assembly can drive the stirring shaft assembly to rotate and reciprocate vertically, and the stirring shaft assembly has two stirring states; state one, in the thin liquid state, the stirring shaft assembly drives the stirring member to rotate and stir on its horizontal plane; state two, in the thick liquid state, the stirring shaft assembly drives the stirring member to reciprocate in the vertical direction, and the thick liquid can surge upward repeatedly. The present invention assists the floating and separation of bubbles by switching the stirring state, so as to reduce the residence time of waste gas in the fermentation liquid and avoid the subsequent influence on the growth and metabolism of bacteria.

Description

Technical Field

[0001] The invention relates to the technical field of bacillus subtilis fermentation, in particular to a fermentation tank for preparing bacillus subtilis powder. Background Art

[0002] Bacillus subtilis is a microorganism widely used in industrial fermentation. Due to its strong stress resistance and metabolic capacity, it is widely used to produce enzymes, antibiotics, vitamins and other metabolites. In order to achieve efficient Bacillus subtilis fermentation production, the design and optimization of the fermentation tank is crucial.

[0003] For example, Chinese patent CN220951778U discloses a Bacillus subtilis fermenter, which has a vertically movable defoaming assembly on a synchronous shaft, and cooperates with a float bag so that the defoaming rod is always located above the raw material liquid surface, so that the bubbles on the liquid surface can be broken during the mixing process, thereby avoiding the continuous generation of bubbles that will bring a lot of fermentation liquid to the top of the fermenter and cause overflow, which is beneficial to the fermentation of Bacillus subtilis.

[0004] However, as the fermentation time of Bacillus subtilis increases, the fermentation broth will gradually become thicker, which will make it difficult for the waste gas (mainly including carbon dioxide, hydrogen, etc.) produced by the fermentation in the fermentation broth to float up and be discharged from the fermentation broth, thereby prolonging the residence time of the waste gas in the fermentation broth. This may not only reduce the oxygen transfer efficiency in the fermentation broth and cause insufficient dissolved oxygen, but also carbon dioxide will dissolve in the fermentation broth to form carbonic acid, causing the pH value of the fermentation broth to decrease, thereby affecting the growth and metabolism of the bacteria. Therefore, it is necessary to discharge the waste gas generated during the fermentation process from the fermentation broth in time. Summary of the invention

[0005] The object of the present invention is to provide a fermentation tank for preparing Bacillus subtilis powder, so as to solve at least one technical problem existing in the above-mentioned prior art.

[0006] To achieve the above object, the present invention provides the following technical solution: a fermentation tank for preparing Bacillus subtilis powder, comprising a fermentation tank and a top cover installed on the top thereof, and further comprising:

[0007] A partition is installed on the inner wall of the top cover, and a stirring shaft assembly is vertically installed at the center of the partition, and multiple groups of stirring members are installed on the outer wall of the stirring shaft assembly;

[0008] A driving assembly, wherein the driving assembly can drive the stirring shaft assembly to rotate and move vertically back and forth, and enables the stirring shaft assembly to have two stirring states;

[0009] State 1: In the dilute liquid state, the stirring shaft assembly drives the stirring element to rotate and stir on its horizontal plane;

[0010] State 2: In the thick liquid state, the stirring shaft assembly drives the stirring element to move back and forth in the vertical direction, and enables the thick liquid to surge upward repeatedly.

[0011] Preferably, the stirring shaft assembly includes a central shaft and a sleeve which are socketed with each other, and the central shaft and the sleeve can rotate and slide. The top end of the central shaft passes through the top of the top cover and is slidably connected to the penetration portion of the top cover. A piston tube is rotatably installed at the inner bottom of the fermentation tank, and the bottom end of the central shaft is vertically slidably installed in the piston tube. A spring sleeved on the outer wall of the central shaft is connected between the piston tube and the sleeve, and a through hole is also opened in the center of the partition for the sleeve to pass through.

[0012] Preferably, the stirring member includes a first support rod fixed to the outer wall of the sleeve, an oblique groove is formed on the outer wall of the sleeve near the first support rod, a second support rod extending from the oblique groove is fixed to the outer wall of the central axis, and a foldable sheet that can be folded or unfolded is commonly connected between the second support rod and the first support rod, and when the second support rod is located at the end positions on both sides of the oblique groove, it is respectively in the same horizontal plane or the same vertical plane as the first support rod.

[0013] Preferably, the driving assembly comprises two transmission discs fixed on the outer wall of the sleeve, and a first bevel gear is coaxially fixedly mounted on the top surface of the transmission disc located below;

[0014] The driving assembly also includes a swing frame installed on the top of the partition and capable of reciprocating and uniformly rotating. Contact wheels are rotatably installed on the opposite surfaces of the two support arms of the swing frame. The two contact wheels are located between the two transmission discs, and the diameter of the contact wheels is smaller than the spacing between the two transmission discs. One of the contact wheels is also coaxially fixed with a second bevel gear smaller than its diameter, and the second bevel gear can mesh with the first bevel gear. A servo motor for driving the contact wheel to rotate is also installed on the outer wall of the support arm of the swing frame close to the second bevel gear.

[0015] The driving assembly further comprises a locking structure for locking the central shaft and the sleeve.

[0016] Preferably, the locking structure comprises a mounting hole provided inside the central axis, and an elastic bead is installed in the mounting hole, and a locking hole for the elastic bead to be inserted is provided on the inner wall of the sleeve.

[0017] Preferably, a plurality of bottom catching rods distributed in a ring shape are fixed to the outer wall of the piston tube, a piston block is fixed to the bottom end of the central axis located in the piston tube, and a sealed space is formed between the bottom surface of the piston block and the piston tube, an air outlet channel connected to the sealed space is provided inside the bottom catching rod, and a one-way valve for only one-way discharge of air is installed in the air outlet channel, an exhaust hole connected to the air outlet channel is provided on the outer wall of the bottom catching rod, an air inlet channel is provided inside the central axis, a one-way valve for only sucking air into the sealed space is installed in the air inlet channel, and the top inlet of the air inlet channel is located in the space above the partition.

[0018] Preferably, a plurality of balls are mounted on the annular outer wall of the contact wheel, and the contact wheel is in rolling contact with the transmission disc through the balls.

[0019] Preferably, the outer wall of the foldable sheet is provided with a through hole.

[0020] Preferably, the central shaft and the piston tube are slidably connected via a flat key.

[0021] Preferably, both sides of the folding sheet are connected with empty tubes, and the empty tubes on both sides are rotatably sleeved on the first support rod and the second support rod respectively.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the clear liquid state, the folded sheet of the present invention rotates and stirs on the horizontal plane where it is located. The stirring can increase the dissolved oxygen content in the fermentation liquid on the one hand, which is conducive to the growth of bacteria. On the other hand, the disturbance of the fermentation liquid can also make the generated bubbles float up quickly and break and separate from the fermentation liquid. In the thick liquid state, the vertical movement of the folded sheet can drive the fermentation liquid to surge upward, exerting an upward movement trend on the bubbles generated in the fermentation liquid, so that the bubbles can float up quickly and break, thereby achieving the above-mentioned purpose of reducing the residence time of the bubbles in the fermentation liquid, thereby avoiding affecting the fermentation liquid and the fermentation process.

[0024] Second, the present invention can make the liquid surface of the fermentation liquid fluctuate in the vertical direction through the upwelling of the fermentation liquid, which helps to tear and break the bubble layer on the surface of the liquid, thereby achieving a certain defoaming effect and eliminating the separation layer formed by the bubbles on the surface of the fermentation liquid. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure of the fermentation tank of the present invention;

[0026] Figure 2 It is a front cross-sectional view of the fermentation tank of the present invention;

[0027] Figure 3 For the present invention Figure 2 A in the enlarged view;

[0028] Figure 4 This is a schematic diagram of a state in which the first support rod and the second support rod of the present invention are in the same vertical plane;

[0029] Figure 5 This is a schematic diagram of a state in which the first support rod and the second support rod of the present invention are in the same horizontal plane;

[0030] Figure 6 For the present invention Figure 2 Cutaway stereograms and partial magnified diagrams from different viewing angles;

[0031] Figure 7 It is a partially enlarged stereoscopic view of the transmission plate and the swing frame of the present invention;

[0032] Figure 8 It is an enlarged stereoscopic view of the swing frame and the structure thereon of the present invention.

[0033] In the figure: 1. fermentation tank; 2. top cover; 3. partition; 4. central axis; 5. sleeve; 6. piston block; 7. piston tube; 8. bottom scoop rod; 9. air outlet channel; 10. exhaust hole; 11. air inlet channel; 12. spring; 13. first support rod; 14. inclined groove; 15. second support rod; 16. folding sheet; 17. through hole; 18. transmission plate; 19. first bevel gear; 20. swing frame; 21. contact wheel; 22. second bevel gear; 23. ball; 24. servo motor; 25. elastic card bead; 26. lock hole. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] See also Figures 1 to 8 The present invention provides a technical solution: a fermentation tank for preparing Bacillus subtilis powder, comprising a fermentation tank 1 and a top cover 2 installed on the top thereof, and also comprising:

[0036] A partition 3 is installed on the inner wall of the top cover 2, and a stirring shaft assembly is vertically installed at the center of the partition 3, and multiple groups of stirring members are installed on the outer wall of the stirring shaft assembly;

[0037] A driving assembly, which can drive the stirring shaft assembly to rotate and move vertically back and forth, and enables the stirring shaft assembly to have two stirring states;

[0038] State 1: In the dilute liquid state, the stirring shaft assembly drives the stirring element to rotate and stir on its horizontal plane;

[0039] State 2: In the thick liquid state, the stirring shaft assembly drives the stirring element to move back and forth in the vertical direction, and enables the thick liquid to surge upward repeatedly.

[0040] The preparation process of Bacillus subtilis powder can be roughly divided into the following steps: fermentation, separation, drying, crushing and mixing to form a uniform powder preparation. Among them, in the fermentation process, the commonly used method is liquid fermentation. During the whole fermentation process, the state of the fermentation liquid will change with the growth and metabolic activity of the bacteria, from clear to turbid, from clear liquid to thick, and gas will be generated during the fermentation process;

[0041] In the clear liquid state, due to the good fluidity of the fermentation liquid, the generated gas can float to the top surface of the fermentation liquid in time and separate from the fermentation liquid. As the fermentation time increases, the fermentation liquid gradually becomes thicker. At this time, the floating speed of the gas in the fermentation liquid will slow down, thereby prolonging the residence time of the waste gas in the fermentation liquid. This phenomenon is especially prone to occur in tiny bubbles. Therefore, in this case, the switching of the stirring state is used to assist the floating and separation of the bubbles, so as to reduce the residence time of the waste gas in the fermentation liquid and avoid the subsequent impact on the growth and metabolism of the bacteria. The specific methods are as follows:

[0042] First, in the early stage of fermentation, that is, the fermentation liquid is still in a dilute liquid state (i.e., the clear liquid mentioned above), the driving component will drive the stirring shaft component to rotate and make the stirring element rotate and stir on its horizontal plane. Stirring can increase the dissolved oxygen content in the fermentation liquid on the one hand, which is conducive to the growth of bacteria. On the other hand, the disturbance of the fermentation liquid can also make the generated bubbles float up and burst quickly, and separate from the fermentation liquid.

[0043] As the fermentation proceeds, in the later stage of fermentation, the fermentation liquid gradually becomes thicker. At this time, the driving assembly will drive the stirring shaft assembly to move vertically back and forth, and the stirring element will drive the fermentation liquid to surge upward, exerting an upward movement trend on the bubbles generated in the fermentation liquid, so that the bubbles can quickly float up and burst, thereby achieving the above-mentioned purpose of reducing the residence time of bubbles in the fermentation liquid, thereby avoiding affecting the fermentation liquid and the fermentation process.

[0044] In addition, it is worth mentioning that in actual processing, it was found that after the bubbles produced by fermentation float to the liquid surface, they tend to form an isolation layer of bubbles on the liquid surface, thereby reducing the concentration of dissolved oxygen in the fermentation liquid and affecting the normal fermentation of Bacillus subtilis. The upwelling of the fermentation liquid in state two can make the liquid surface of the fermentation liquid fluctuate vertically, which helps to tear and break the bubble layer on the surface of the liquid, thereby achieving a certain defoaming effect.

[0045] Moreover, in the later stages of fermentation, due to the exhaustion of nutrients and the accumulation of metabolites, the bacteria begin to die, the number of cells decreases, and the fermentation liquid may precipitate or stratify. Therefore, repeated surging in the vertical direction can also avoid precipitation and stratification of the fermentation liquid.

[0046] In one of the more preferred embodiments, an implementation of a stirring shaft assembly is provided, which can be specifically referred to in Figure 2-3 ;

[0047] The stirring shaft assembly includes a central shaft 4 and a sleeve 5 which are sleeved with each other, and the central shaft 4 and the sleeve 5 can rotate and slide. The top end of the central shaft 4 passes through the top of the top cover 2 and is slidably connected to the penetration portion of the top cover 2. A piston tube 7 is rotatably installed at the inner bottom of the fermentation tank 1, and the bottom end of the central shaft 4 is vertically slidably installed in the piston tube 7. A spring 12 sleeved on the outer wall of the central shaft 4 is connected between the piston tube 7 and the sleeve 5. A through hole is also opened in the center of the partition 3 for the sleeve 5 to pass through.

[0048] In the above state 1, the driving assembly drives the central shaft 4 and the sleeve 5 to rotate together, and the central shaft 4 also drives the piston tube 7 below to rotate together, thereby driving the stirring element installed outside to rotate in the horizontal plane where it is located to disturb the fermentation liquid;

[0049] In the above state 2, the driving assembly drives the central shaft 4 and the sleeve 5 to slide vertically together, and at the same time, the bottom end of the central shaft 4 slides vertically in the piston tube 7, thereby driving the stirring element installed outside thereof to move in the vertical direction, and causing the fermentation liquid to surge upward repeatedly, so that the central shaft 4 and the sleeve 5 can be switched between state 1 and state 2.

[0050] The arrangement of the spring 12 can provide a certain elastic support for the sleeve 5 .

[0051] In one of the more preferred embodiments, an implementation of a stirring member is provided, which can be specifically referred to in Figure 4-5 ;

[0052] The stirring member includes a first support rod 13 fixed to the outer wall of the sleeve 5, an outer wall of the sleeve 5 near the first support rod 13 is provided with an inclined groove 14, the outer wall of the central axis 4 is fixed with a second support rod 15 extending from the inclined groove 14, and a foldable or unfoldable folding piece 16 is commonly connected between the second support rod 15 and the first support rod 13, and when the second support rod 15 is located at the end positions on both sides of the inclined groove 14, it is respectively in the same horizontal plane or the same vertical plane as the first support rod 13.

[0053] As can be seen from the figure, there are multiple groups of stirring elements, which are distributed in a circular shape and vertically. Figure 4The state shown is the state of the stirring member in the above state 1, that is, the second support rod 15 is located at the lower end of the inclined groove 14, at this time, the second support rod 15 and the first support rod 13 are in the same vertical plane, and the folding sheet 16 is in a folded state. When such a state is rotated in the horizontal direction, the folding sheet 16 can expand the disturbance range of the fermentation liquid, which is also helpful to increase the oxygen content in the fermentation liquid;

[0054] and Figure 5 The figure shows the state of the stirring member in the above-mentioned state 2, that is, the second support rod 15 is located at the upper end position of the inclined groove 14, at this time, the second support rod 15 and the first support rod 13 are in the same horizontal plane, and the folding sheet 16 is in an unfolded state, expanding its bottom-covering range so that it can drive the fermentation liquid to surge upward during the vertical movement, thereby achieving the above-mentioned effect of accelerating the floating of bubbles in the fermentation liquid.

[0055] In one of the more preferred embodiments, an implementation of a drive assembly is provided, which can be specifically referred to in Figure 6-8 ;

[0056] The driving assembly includes two transmission discs 18 fixed to the outer wall of the sleeve 5, and a first bevel gear 19 is coaxially fixedly mounted on the top surface of the lower transmission disc 18;

[0057] The driving assembly also includes a swing frame 20 installed on the top of the partition 3 and capable of reciprocating and uniformly rotating. The two support arms of the swing frame 20 are rotatably mounted with contact wheels 21 on opposite surfaces. The two contact wheels 21 are both located between the two transmission disks 18, and the diameter of the contact wheels 21 is smaller than the spacing between the two transmission disks 18. One of the contact wheels 21 is also coaxially fixed with a second bevel gear 22 smaller than its diameter, and the second bevel gear 22 can mesh with the first bevel gear 19. The outer wall of the support arm of the swing frame 20 close to the second bevel gear 22 is also mounted with a servo motor 24 for driving the contact wheel 21 to rotate.

[0058] The driving assembly further comprises a locking structure for locking the central shaft 4 and the sleeve 5 .

[0059] Embodiment 1:

[0060] During the fermentation process, the second bevel gear 22 connected to it is driven to rotate by the servo motor 24, and the meshing transmission with the first bevel gear 19 can drive the transmission plate 18 and the sleeve 5 to rotate together. Although the contact wheel 21 is in contact with the transmission plate 18 below, the friction between the two is not enough to hinder the rotation of the transmission plate 18 due to the small contact area, and will not affect the driving rotation of the sleeve 5. The setting of the contact wheel 21 is mainly to cooperate with the reciprocating swing of the swing frame 20 to drive the transmission plate 18 to move up and down, thereby driving the sleeve 5 to move vertically.

[0061] From the above content, we can see that Figure 4 In state 1, the second support rod 15 is located at the lower end of the inclined slot 14. At this time, when the sleeve 5 rotates, the central shaft 4 can be driven to rotate by the blocking effect of the inclined slot 14 on the second support rod 15, so that the central shaft 4 and the sleeve 5 can rotate together to achieve the disturbance effect in the above state 1;

[0062] In state 2, the sleeve 5 can be driven to rotate in the opposite direction by the servo motor 24. At the same time, the sleeve 5 can rotate relative to the central shaft 4 under the rotation damping effect of the piston tube 7 on the central shaft 4. In combination with the downward swing of the swing frame 20, the sleeve 5 can rotate in the opposite direction while moving downward, so that the second support rod 15 can move in the inclined groove 14 until it is transformed into Figure 5 The state shown, that is, the second support rod 15 is located at the upper end position of the inclined groove 14, at this time, the locking structure locks the central shaft 4 and the sleeve 5, so that the first support rod 13 and the second support rod 15 can be maintained in this state, completing the state switching of the stirring member;

[0063] Then, the swing of the swing frame 20 will drive the contact wheel 21 to move upward, so that it contacts and abuts against the transmission plate 18 above, and at the same time, the two bevel gears are disengaged from each other, so as to release the restriction on the rotation of the subsequent sleeve 5 during the upward movement. As the swing frame 20 swings, under the locking action of the locking structure, the sleeve 5 and the central shaft 4 will move upward together, so that the folding sheet 16 spread out horizontally can carry the fermentation liquid and surge upward, thereby achieving the above-mentioned upward surge effect. At the end of the upward movement, the central shaft 4 first moves to the lower piston tube 7, and the locking structure releases the locking effect on the sleeve 5 and the central shaft 4, so the central shaft 4 cannot continue to move upward under the limit of the piston tube 7, and the continued upward movement of the sleeve 5 will cause the second support rod 15 to move in the inclined groove 14, and the sleeve 5 will also rotate under the action of the two, so that the sleeve 5 at the end of the upward movement of the first support rod 13 and the second support rod 15 are switched back to the state of state 1, the purpose of which is to prevent the unfolded folding sheet 16 from squeezing the fermentation liquid downward when the sleeve 5 and the central shaft 4 are reset downward;

[0064] In this way, by switching the states of the first support rod 13 and the second support rod 15, the folding sheet 16 can be moved upward. Figure 5 , and switches to the expanded state when the move up is complete. Figure 4 state, so that when it moves downward and resets, it can reduce the contact area with the fermentation liquid in the vertical direction, so as to avoid driving the fermentation liquid downward when moving downward, and achieve the purpose of only driving the fermentation liquid upward.

[0065] Embodiment 2: Based on the above embodiment 1, a second embodiment is provided. It can be seen from the above content that when the second support rod 15 is at the upper end of the inclined groove 14, the first support rod 13 and the second support rod 15 are in the same plane, that is, the folding piece 16 is in a horizontal state, and at this time, the locking structure locks the sleeve 5 and the central shaft 4;

[0066] The length of the inclined groove 14 can also be set so that when the second support rod 15 is at the upper end of the inclined groove 14, the first support rod 13 and the second support rod 15 are on the same inclined surface, so that the folding piece 16 is in an inclined state, and the overall folding piece 16 forms a shape similar to a fan blade surface. Then, the locking structure locks the sleeve 5 and the central axis 4, and then the sleeve 5 can be directly driven to rotate in the above manner, and the shape of the fan blade surface formed by the folding piece 16 can be used to apply an upward force to the fermentation liquid, thereby achieving the above-mentioned effect of the fermentation liquid surging.

[0067] In one of the more preferred embodiments, a locking structure implementation is provided, which can be specifically referred to in Figure 5 and Figure 6 ;

[0068] The locking structure comprises a mounting hole formed inside the central shaft 4 , in which an elastic bead 25 is mounted. The inner wall of the sleeve 5 is provided with a locking hole 26 into which the elastic bead 25 can be inserted.

[0069] in, Figure 6 The figure shows the state where the elastic card bead 25 is not inserted into the lock hole 26. Figure 5 The elastic card bead 25 is in a state of being inserted into the locking hole 26. During the rotation and movement of the sleeve 5, the locking hole 26 can correspond to the position of the elastic card bead 25, so that it can be inserted therein, thereby completing the locking of the sleeve 5 and the central shaft 4. As shown in the figure, the elastic card bead 25 can be realized by means of a built-in spring;

[0070] And in the above content, during the upward movement of the sleeve 5 and the center shaft 4, when the center shaft 4 cannot continue to move upward due to the limitation of the piston tube 7, the continued upward movement of the sleeve 5 will cause the locking hole 26 to press the elastic card bead 25 back into the mounting hole of the center shaft 4, thereby enabling it to be automatically unlocked.

[0071] In one of the more preferred embodiments, a plurality of bottom scooping rods 8 distributed in a ring shape are fixed to the outer wall of the piston tube 7, a piston block 6 is fixed to the bottom end of the central axis 4 located in the piston tube 7, and a sealed space is formed between the bottom surface of the piston block 6 and the piston tube 7, an air outlet channel 9 connected to the sealed space is opened inside the bottom scooping rod 8, and a one-way valve for only one-way discharge of air is installed in the air outlet channel 9, an exhaust hole 10 connected to the air outlet channel 9 is opened on the outer wall of the bottom scooping rod 8, an air intake channel 11 is opened inside the central axis 4, a one-way valve for only sucking air into the sealed space is installed in the air intake channel 11, and the top inlet of the air intake channel 11 is located in the space above the partition 3.

[0072] It can be seen from the above content that the central axis 4 is in state 2 when it moves vertically. At this time, the fermentation liquid is in a state of thick liquid. Therefore, in order to accelerate the floating of tiny bubbles in the fermentation liquid, during the up and down movement of the central axis 4, the piston block 6 at its bottom end will inhale air into the piston tube 7 through the air inlet channel 11, and discharge it through the air outlet channel 9 and the exhaust hole 10 to form large bubbles in the fermentation liquid. Through the merging of bubbles, the large bubbles merge the tiny bubbles in the fermentation liquid. On the one hand, it can accelerate the floating of the bubbles, and on the other hand, it can also make the large bubbles on the liquid surface easier to break.

[0073] Moreover, the bottom scooping rod 8 can also disturb and lift the sediment below the fermentation tank 1 during the rotation of the piston tube 7 to avoid stratification of the fermentation liquid.

[0074] In one of the more preferred embodiments, a plurality of balls 23 are mounted on the annular outer wall of the contact wheel 21 , and the contact wheel 21 is in rolling contact with the transmission disc 18 through the balls 23 .

[0075] See also Figure 8 As can be seen from the above content, the contact wheel 21 mainly drives the transmission plate 18 to move up and down. Therefore, the smaller the friction between the contact wheel 21 and the transmission plate 18, the better. The setting of the ball 23 can further reduce the friction contact between the two, which also makes the reset rotation of the sleeve 5 in the upward movement process smoother.

[0076] In one of the more preferred embodiments, a through hole 17 is formed on the outer wall of the foldable sheet 16 .

[0077] See also Figure 5 The provision of the through hole 17 can reduce the resistance encountered by the folding sheet 16 during the upward movement, so as to avoid excessive resistance encountered by the folding sheet 16.

[0078] In one of the more preferred embodiments, the center shaft 4 and the piston tube 7 are slidably connected via a flat key. The flat key allows the piston tube 7 to rotate together with the center shaft 4 without affecting the movement and adjustment of the two in the axial direction.

[0079] In one of the more preferred embodiments, both sides of the folding sheet 16 are connected with empty tubes, and the empty tubes on both sides are rotatably sleeved on the first support rod 13 and the second support rod 15 respectively.

[0080] See also Figure 5 By providing the empty tubes on both sides, the deviation between the folding sheet 16 and the first support rod 13 and the second support rod 15 when folding or unfolding can be eliminated.

[0081] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and the drawings can also be directly processed according to the existing technical common sense. At the same time, the connection method of each component adopts the mature conventional means in the prior art, and the machinery, parts and equipment all adopt the conventional models in the prior art, so no specific description will be given here.

[0082] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A fermentation tank for preparing Bacillus subtilis powder, comprising a fermentation tank (1) and a top cover (2) installed on the top of the fermentation tank, characterized in that: Also includes: A partition (3) is installed on the inner wall of the top cover (2), and a stirring shaft assembly is vertically installed at the center of the partition (3), and a plurality of stirring members are installed on the outer wall of the stirring shaft assembly; A driving assembly, wherein the driving assembly can drive the stirring shaft assembly to rotate and move vertically back and forth, and enables the stirring shaft assembly to have two stirring states; State 1: In the dilute liquid state, the stirring shaft assembly drives the stirring element to rotate and stir on its horizontal plane; State 2: In the thick liquid state, the stirring shaft assembly drives the stirring element to move back and forth in the vertical direction, and enables the thick liquid to surge upward repeatedly; The stirring shaft assembly comprises a central shaft (4) and a sleeve (5) which are sleeved with each other, and the central shaft (4) and the sleeve (5) are capable of rotating and sliding. The top end of the central shaft (4) passes through the top of the top cover (2) and is slidably connected to the penetration portion of the top cover (2). A piston tube (7) is rotatably mounted on the inner bottom of the fermentation tank (1). The bottom end of the central shaft (4) is vertically slidably mounted in the piston tube (7). A spring (12) sleeved on the outer wall of the central shaft (4) is connected between the piston tube (7) and the sleeve (5). A through hole is also provided at the center of the partition plate (3) for the sleeve (5) to pass through. The stirring member comprises a first support rod (13) fixed to the outer wall of the sleeve (5); an inclined groove (14) is provided on the outer wall of the sleeve (5) close to the first support rod (13); a second support rod (15) extending from the inclined groove (14) is fixed to the outer wall of the central shaft (4); a foldable or unfoldable folding sheet (16) is connected between the second support rod (15) and the first support rod (13); when the second support rod (15) is located at the end positions on both sides of the inclined groove (14), it is respectively in the same horizontal plane or the same vertical plane as the first support rod (13); The driving assembly comprises two transmission discs (18) fixed to the outer wall of the sleeve (5), and a first bevel gear (19) is coaxially fixedly mounted on the top surface of the transmission disc (18) located below; The driving assembly further comprises a swing frame (20) mounted on the top of the partition (3) and capable of reciprocating and uniformly rotating, contact wheels (21) being rotatably mounted on opposite surfaces of two support arms of the swing frame (20), the two contact wheels (21) being located between the two transmission discs (18), and the diameter of the contact wheels (21) being smaller than the spacing between the two transmission discs (18), one of the contact wheels (21) being coaxially fixedly mounted with a second bevel gear (22) having a smaller diameter than the contact wheel (21), and the second bevel gear (22) being capable of meshing with the first bevel gear (19), and a servo motor (24) for driving the contact wheels (21) to rotate being mounted on the outer wall of the support arm of the swing frame (20) on the side close to the second bevel gear (22); The drive assembly also includes a locking structure for locking the central shaft (4) and the sleeve (5).

2. The fermentation tank for preparing the Bacillus subtilis powder according to claim 1, characterized in that: The locking structure comprises a mounting hole formed inside the central shaft (4), and an elastic locking bead (25) is installed in the mounting hole. The inner wall of the sleeve (5) is provided with a locking hole (26) into which the elastic locking bead (25) can be locked.

3. The fermentation tank for preparing the Bacillus subtilis powder according to claim 1, characterized in that: The outer wall of the piston tube (7) is fixed with a plurality of bottom-catching rods (8) distributed in an annular shape; the bottom end of the central axis (4) located in the piston tube (7) is fixed with a piston block (6); a sealed space is formed between the bottom surface of the piston block (6) and the piston tube (7); an air outlet channel (9) communicating with the sealed space is provided inside the bottom-catching rod (8); a one-way valve for only one-way discharge of air is installed in the air outlet channel (9); an exhaust hole (10) communicating with the air outlet channel (9) is provided on the outer wall of the bottom-catching rod (8); an air inlet channel (11) is provided inside the central axis (4); a one-way valve for only sucking air into the sealed space is installed in the air inlet channel (11); and a top inlet of the air inlet channel (11) is located in the space above the partition (3).

4. The fermentation tank for preparing the Bacillus subtilis powder according to claim 1, characterized in that: A plurality of balls (23) are mounted on the annular outer wall of the contact wheel (21), and the contact wheel (21) is in rolling contact with the transmission disc (18) via the balls (23).

5. The fermentation tank for preparing the Bacillus subtilis powder according to claim 1, characterized in that: The outer wall of the folding sheet (16) is provided with a through hole (17).

6. A fermentation tank for preparing the Bacillus subtilis powder according to any one of claims 1 to 5, characterized in that: The central shaft (4) and the piston tube (7) are slidably connected via a flat key.

7. The fermentation tank for preparing the Bacillus subtilis powder according to claim 1, characterized in that: Both sides of the folding sheet (16) are connected to empty tubes, and the empty tubes on both sides are rotatably sleeved on the first support rod (13) and the second support rod (15) respectively.

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