Microbial inoculant culture apparatus

Abstract

The application discloses a kind of microbial inoculant culture equipment, belong to microorganism culture field, including culture tank, the top of the culture tank is threadedly connected with sealing cover, the upper surface of the sealing cover is provided with the stirring assembly for stirring culture solution, the stirring assembly includes the driving motor fixed on the upper surface of sealing cover and the annular ring slidingly arranged on the inner surface of culture tank, the inner side of the annular ring is fixedly connected with the triangular plate. The shaft can be rotated, the contact rod slides on the inclined surface of the triangular plate, the second stirring blade is driven to swing by transmission, so that the second stirring blade swings back and forth while moving in a circle, under the cooperation of the second stirring blade and the connecting shaft, the stirring range can be effectively expanded, two different stirring modes are realized, the fusion of two stirring modes is realized, and the survival rate of microorganisms is improved.

Description

Technical Field

[0001] This invention relates to the field of microbial culture, and more specifically, to a microbial inoculant culture device. Background Technology

[0002] Microbial fermentation refers to the process by which microorganisms, under suitable conditions, transform raw materials into products needed by humans through specific metabolic pathways. The production level of microbial fermentation mainly depends on the genetic characteristics of the microbial strain and the culture conditions, and it is widely used in industries such as pharmaceuticals, food, energy, chemicals, and agriculture. Nematode-controlling microbial agents are biological agents that utilize beneficial microorganisms to control plant parasitic nematodes such as root-knot nematodes.

[0003] Microbial agents need to be mixed with fermentation broth during cultivation, but existing microbial agent cultivation devices have poor flowability of fermentation broth when filled with it, making it difficult to mix the fermentation broth effectively.

[0004] To address the aforementioned issues, Chinese Patent No. CN212451386U discloses a microbial agent cultivation device. While this device achieves the cultivation of microbial agents and the stirring of the fermentation broth during the cultivation process, its stirring method and range are relatively simple, resulting in uneven distribution of the fermentation broth. Furthermore, the stirring depth is fixed, which affects the fermentation of the microbial agents. Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a microbial inoculant cultivation device.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A microbial inoculant culture device includes a culture tank, the top of which is threaded with a sealing cap, the bottom of which is provided with a solenoid valve, and the upper surface of the sealing cap is provided with a stirring component for stirring the culture solution.

[0008] The stirring assembly includes a drive motor fixed to the upper surface of the sealing cap and a ring slidably disposed on the inner surface of the culture tank. A triangular plate is fixedly connected to the inner side of the ring. A rotating shaft is fixedly connected to the output end of the drive motor. A first stirring blade is symmetrically connected to the outer surface of the rotating shaft. A connecting shaft is rotatably connected inside the first stirring blade. C-shaped rods are fixedly connected to both ends of the connecting shaft. A second stirring blade is fixedly connected to the bottom of the C-shaped rods. A drive frame is fixedly connected to the top of the C-shaped rods. A drive shaft is slidably connected inside the drive frame. Rectangular frames are fixedly connected to both sides of the drive shaft. A contact rod and a spring are fixedly connected to both sides of the rectangular frames, respectively.

[0009] Furthermore, one side of the spring is fixedly connected to the outer surface of the rotating shaft, the other side of the contact rod is in contact with the inclined surface of the triangular plate, the two sides of the connecting rotating shaft extend into the interior of the first stirring blade, the C-shaped rod is sleeved on the outer surface of the first stirring blade, a limiting rod is provided on the side of the rectangular frame near the spring, and the limiting rod extends into the interior of the rotating shaft and slides against each other, the spring is sleeved on the outer surface of the limiting rod, the number of triangular plates is odd, a pitch-changing assembly is provided on one side of the upper surface of the sealing cover, and a material-turning assembly is provided at the bottom of the culture tank.

[0010] Furthermore, the pitch-changing assembly includes a support shaft rotating at the edge of the upper surface of the sealing cover, a drive shaft rotating inside the sealing cover, and an annular rack fixed to the top of the ring. The outer surfaces of the support shaft and the outer surfaces of the rotating shaft are fixedly connected to a first gear, and a timing belt is sleeved on the outer surfaces of the two first gears. A disc is fixedly connected to the top of the support shaft, and multiple arc-shaped racks are fixedly connected to the outer surface of the disc. A second gear is fixedly connected to the top of the drive shaft, and a third gear is fixedly connected to the bottom of the drive shaft.

[0011] Furthermore, the top of the drive shaft extends into the interior of the sealing cover, the third gear meshes with the annular rack, the second gear and the disk are at the same horizontal height, and the arc-shaped rack and the second gear mesh with each other.

[0012] Furthermore, four arc-shaped racks are provided, each with a different length, and each arc-shaped rack meshes with the second gear.

[0013] Furthermore, the material turning assembly includes an air inlet pipe fixed to the bottom of the culture tank and two material turning plates fixed to the outer surface of the rotating shaft near the bottom. A slot is opened in the middle of the bottom of the material turning plate. An air distribution pipe is fixedly connected to the top of the air inlet pipe, and multiple air outlets are provided on the outer surface of the air distribution pipe.

[0014] Furthermore, the air distribution pipe is located inside the slot, the turning plate is at a 45-degree angle to the horizontal, the bottom of the turning plate is in contact with the bottom of the culture tank, and the outer surface of the air inlet pipe is provided with a heat insulation layer.

[0015] Furthermore, adjustment components are provided on both sides of the top of the sealing cover. The adjustment components include a mounting plate fixedly connected to the top of the sealing cover, a first bevel gear fixed to the outer surface of the rotating shaft, and a pH sensor fixed to the inner surface of the culture tank. A hydraulic rod is fixedly connected to the inner bottom of the mounting plate, and a feeding pipe is fixedly connected to the output end of the hydraulic rod. A circular frame is fixedly connected to the bottom of the feeding pipe. An outlet is opened on the outer surface of the circular frame. A rubber block is rotatably connected inside the circular frame. A storage groove is opened on the outer surface of the rubber block. A circular rod is fixedly connected to one side of the rubber block, and a second bevel gear is fixedly connected to one side of the circular rod.

[0016] Furthermore, the feeding tube is located inside the sealing cover, and the feeding tube and the sealing cover slide against each other. One side of the round rod extends out of the interior of the round frame, and the first bevel gear and the second bevel gear mesh with each other.

[0017] Furthermore, a sealing plug is fitted inside the top of the feeding tube, and the inside of the feeding tube is connected to the inside of the circular frame. The two hydraulic rods are controlled by signals respectively.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. This solution incorporates a stirring assembly. As the rotating shaft rotates, the contact rod slides on the inclined surface of the triangular plate, driving the second stirring blade to oscillate via transmission. This causes the second stirring blade to oscillate back and forth in a circular motion. With the cooperation of the second stirring blade and the connecting rotating shaft, the stirring efficiency can be effectively improved, achieving two different stirring methods. These two stirring methods can be integrated and superimposed without interference, effectively ensuring the full integration of microorganisms and fermentation broth, improving the fluidity of the fermentation broth, and increasing the survival rate of microorganisms.

[0020] 2. This solution incorporates a variable pitch component. When the arc-shaped rack drives the second gear to rotate, the different lengths of the four arc-shaped racks cause the rotation angles of the second and third gears to change. This alters the distance the ring rack drives the circular ring and triangular plate to move each time, resulting in varying distances of movement for the triangular plate each time. Consequently, the second stirring blade oscillates differently within the fermentation broth each time, further expanding the stirring range of the fermentation broth and improving the uniformity of mixing between microorganisms and the fermentation broth.

[0021] 3. This solution incorporates a material-turning component. When the shaft rotates, it simultaneously drives two tilted material-turning plates to rotate. During rotation, the material-turning plates push the fermentation liquid at the bottom upwards and towards the second stirring blades, thus agitating the fermentation liquid at the bottom. The rotation of the material-turning plates also agitates the air bubbles ejected from the air outlet, increasing the time the bubbles remain in the fermentation liquid. Simultaneously, the beating action of the second stirring blades breaks large bubbles into smaller ones, increasing the contact area between oxygen and the microorganisms inside the fermentation liquid, shortening the microbial culture cycle, and improving culture efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention;

[0023] Figure 2 This is a cross-sectional structural diagram of the present invention;

[0024] Figure 3 This is a schematic diagram of the annular structure of the present invention;

[0025] Figure 4 This is a schematic diagram of the stirring assembly structure of the present invention;

[0026] Figure 5 This is a schematic diagram of the internal structure of the culture tank of the present invention;

[0027] Figure 6 This is a schematic diagram of the variable pitch component structure of the present invention;

[0028] Figure 7 This is a schematic diagram of the material turning component structure of the present invention;

[0029] Figure 8 This is a schematic diagram of the adjustment component structure of the present invention. Figure 1 ;

[0030] Figure 9 This is a schematic diagram of the adjustment component structure of the present invention. Figure 2 ;

[0031] Figure 10 This is a cross-sectional view of the feeding tube of the present invention.

[0032] Explanation of the labels in the diagram:

[0033] 1. Culture jar; 2. Sealing cap;

[0034] 3. Stirring assembly; 31. Drive motor; 32. Rotating shaft; 33. First stirring blade; 34. Triangular plate; 35. Ring; 36. Second stirring blade;

[0035] 37. Pitch-changing assembly; 371. Disc; 372. First gear; 373. Synchronous belt; 374. Second gear; 375. Drive shaft; 376. Arc rack; 377. Third gear; 378. Ring rack; 379. Support shaft;

[0036] 38. Flipping assembly; 381. Flipping plate; 382. Grooving; 383. Air distribution pipe; 384. Air outlet; 385. Air inlet pipe;

[0037] 39. C-shaped rod; 310. Rectangular frame; 311. Drive frame; 312. Drive shaft; 313. Contact rod; 314. Spring; 315. Connecting shaft;

[0038] 4. Adjustment component; 41. Feeding pipe; 42. Hydraulic rod; 43. Circular frame; 44. Liquid outlet; 45. First bevel gear; 46. Second bevel gear; 47. Circular rod; 48. Rubber block; 49. Storage tank; 410. pH sensor; 411. Mounting plate;

[0039] 5. Solenoid valve. Detailed Implementation

[0040] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0041] Please see Figures 1 to 10 A microbial inoculant culture device includes a culture tank 1, a sealing cap 2 threadedly connected to the top of the culture tank 1, a solenoid valve 5 provided at the bottom of the culture tank 1, and a stirring assembly 3 for stirring the culture solution provided on the upper surface of the sealing cap 2.

[0042] like Figure 2-5 As shown, the stirring assembly 3 includes a drive motor 31 fixed to the upper surface of the sealing cover 2 and a ring 35 slidably disposed on the inner surface of the culture tank 1. A triangular plate 34 is fixedly connected to the inner side of the ring 35. A rotating shaft 32 is fixedly connected to the output end of the drive motor 31. A first stirring blade 33 is symmetrically connected to the outer surface of the rotating shaft 32. A connecting shaft 315 is rotatably connected inside the first stirring blade 33. C-shaped rods 39 are fixedly connected to both ends of the connecting shaft 315. A second stirring blade 36 is fixedly connected to the bottom of the C-shaped rod 39. A drive frame 311 is fixedly connected to the top of the C-shaped rod 39. A drive shaft 312 is slidably connected inside the drive frame 311. A rectangular frame 310 is fixedly connected to both sides of the drive shaft 312. A contact rod 313 and a spring 314 are fixedly connected to both sides of the rectangular frame 310, respectively.

[0043] One side of the spring 314 is fixedly connected to the outer surface of the rotating shaft 32, and the other side of the contact rod 313 is in contact with the inclined surface of the triangular plate 34. The two sides of the connecting rotating shaft 315 extend into the interior of the first stirring blade 33. The C-shaped rod 39 is fitted onto the outer surface of the first stirring blade 33. A limiting rod is provided on the side of the rectangular frame 310 near the spring 314, and the limiting rod extends into the interior of the rotating shaft 32 and slides against each other. The spring 314 is fitted onto the outer surface of the limiting rod. The number of triangular plates 34 is odd. A pitch-changing assembly 37 is provided on one side of the upper surface of the sealing cover 2. A material-turning assembly 38 is provided at the bottom of the culture tank 1.

[0044] To ensure sufficient contact between microorganisms and the fermentation broth and to prevent excessive microbial counts in certain areas, the fermentation broth inside culture tank 1 needs to be agitated. The drive motor 31 is started, causing the rotating shaft 32 to rotate. Simultaneously, the rotating shaft 32 drives two first stirring blades 33 in a circular motion. The first stirring blades 33, connected to the rotating shaft 315, drive the U-shaped rod 39 and the second stirring blade 36 in a circular motion, simultaneously driving the contact rod 313 in a circular motion. The contact rod 313 slides along the inner side of the ring 35. When the contact rod 313 contacts the inclined surface of the triangular plate 34, it moves towards the rotating shaft 32, causing the rectangular frame 310 to move horizontally as a whole. After passing through the triangular plate 34, the contact rod 313, under the elastic force of the spring 314, makes the inner side of the ring 35 fit together, thereby enabling the drive shaft 312 to push the drive frame 311 to swing back and forth, causing the C-shaped rod 39 to rotate around the connecting shaft 315. The C-shaped rod 39 then drives the second stirring blade 36 to swing back and forth, so that the second stirring blade 36 swings back and forth in a circular motion. With the cooperation of the second stirring blade 36 and the connecting shaft 315, the stirring range can be effectively increased, realizing two different stirring methods. The two stirring methods are integrated and superimposed without interference, effectively ensuring the full integration of microorganisms and fermentation broth, and improving the survival rate of microorganisms.

[0045] like Figure 2 , Figure 3 and Figure 5 As shown, the variable pitch assembly 37 includes a support shaft 379 that rotates at the edge of the upper surface of the sealing cover 2, a drive shaft 375 that rotates inside the sealing cover 2, and an annular rack 378 fixed to the top of the ring 35. The outer surface of the support shaft 379 and the outer surface of the rotating shaft 32 are fixedly connected to a first gear 372. The outer surfaces of the two first gears 372 are fitted with a timing belt 373. The top of the support shaft 379 is fixedly connected to a disc 371. The outer surface of the disc 371 is fixedly connected to a plurality of arc-shaped racks 376. The top of the drive shaft 375 is fixedly connected to a second gear 374. The bottom of the drive shaft 375 is fixedly connected to a third gear 377.

[0046] The top of the drive shaft 375 extends out of the interior of the sealing cover 2. The third gear 377 meshes with the annular rack 378. The second gear 374 and the disk 371 are at the same horizontal height. The arc rack 376 and the second gear 374 mesh with each other.

[0047] There are four arc-shaped racks 376, each with a different length, and each arc-shaped rack 376 meshes with the second gear 374.

[0048] When the first stirring blade 33 and the second stirring blade 36 are stirring the fermentation liquid, the position of the second stirring blade 36 is fixed for each rotation of the rotating shaft 32. This results in the first stirring blade 33 and the second stirring blade 36 moving in the same trajectory for each rotation. Although the stirring range is larger and the fluidity is improved compared to the traditional stirring method, the improvement effect is limited. Therefore, when the drive motor 31 drives the rotating shaft 32 to rotate and the second stirring blade 36 and the first stirring blade 33 are stirring the fermentation liquid, in order to further improve the stirring range, it is necessary to change the position of the triangular plate 34 to change the swing position of the second stirring blade 36.

[0049] When the rotating shaft 32 rotates, it synchronously drives the first gear 372 to rotate. The first gear 372 drives another first gear 372 to rotate via the synchronous belt 373. The first gear 372 drives the disc 371 to rotate via the support shaft 379. The disc 371 drives multiple arc-shaped racks 376 to rotate. The arc-shaped racks 376 drive the second gear 374 to rotate at a certain angle, which in turn drives the third gear 377 to rotate via the transmission shaft 375. The third gear 377 drives the ring 35 to rotate a certain distance via the ring rack 378, causing multiple triangular plates 34 to change position, thereby enabling... By changing the oscillation position of the second stirring blade 36, when the next arc-shaped rack 376 meshes with the second gear 374, the second gear 374 will continue to rotate. However, the length of the arc-shaped rack 376 is different, which causes the rotation angle of the second gear 374 and the third gear 377 to change. This changes the distance that the ring rack 378 drives the ring 35 and the triangular plate 34 to move. As a result, the distance that the triangular plate 34 moves each time is different, and the oscillation position of the second stirring blade 36 inside the fermentation liquid is different each time. This further expands the range of stirring of the fermentation liquid and further improves the uniformity of mixing between microorganisms and fermentation liquid.

[0050] like Figure 7 As shown, the material turning assembly 38 includes an air inlet pipe 385 fixed to the bottom of the culture tank 1 and two material turning plates 381 fixed to the outer surface of the rotating shaft 32 near the bottom. A slot 382 is provided in the middle of the bottom of the material turning plate 381. An air distribution pipe 383 is fixedly connected to the top of the air inlet pipe 385. Multiple air outlets 384 are provided on the outer surface of the air distribution pipe 383.

[0051] The air distribution pipe 383 is located inside the slot 382. The turning plate 381 is at a 45-degree angle to the horizontal. The bottom of the turning plate 381 is in contact with the bottom of the culture tank 1. The outer surface of the air inlet pipe 385 is provided with a heat insulation layer.

[0052] During microbial cultivation, oxygen needs to be introduced to improve the survival rate of microorganisms. However, the fermentation broth at the bottom of the cultivation tank 1 cannot be stirred. Therefore, when the rotating shaft 32 rotates, it simultaneously drives the two inclined turning plates 381 to rotate. During rotation, the turning plates 381 push the fermentation broth at the bottom upwards and towards the second stirring blade 36, so that the fermentation broth at the bottom can also be stirred. At the same time, the required oxygen is delivered into the air inlet pipe 385. The oxygen enters into the air distribution pipe 383 and is sprayed out through the air outlet 384. The oxygen enters the fermentation broth and forms small bubbles. When the turning plates 381 rotate, they can stir the bubbles, making the bubbles stay in the fermentation broth for a longer time. At the same time, the beating of the second stirring blade 36 can break the large bubbles into small bubbles, increasing the contact area between the oxygen and the microorganisms in the fermentation broth, shortening the microbial cultivation cycle, and improving the cultivation efficiency.

[0053] like Figure 8-10 As shown, adjustment components 4 are provided on both sides of the top of the sealing cover 2. The adjustment components 4 include a mounting plate 411 fixedly connected to the top of the sealing cover 2, a first bevel gear 45 fixedly fixed to the outer surface of the rotating shaft 32, and a pH sensor 410 fixedly fixed to the inner surface of the culture tank 1. A hydraulic rod 42 is fixedly connected to the bottom of the mounting plate 411. A feeding pipe 41 is fixedly connected to the output end of the hydraulic rod 42. A circular frame 43 is fixedly connected to the bottom of the feeding pipe 41. An outlet 44 is opened on the outer surface of the circular frame 43. A rubber block 48 is rotatably connected inside the circular frame 43. A storage trough 49 is opened on the outer surface of the rubber block 48. A round rod 47 is fixedly connected to one side of the rubber block 48. A second bevel gear 46 is fixedly connected to one side of the round rod 47.

[0054] The feeding tube 41 is located inside the sealing cover 2, and the feeding tube 41 and the sealing cover 2 slide against each other. One side of the round rod 47 extends out of the interior of the round frame 43, and the first bevel gear 45 and the second bevel gear 46 mesh with each other.

[0055] A sealing plug is fitted inside the top of the feeding tube 41. The inside of the feeding tube 41 is connected to the inside of the circular frame 43. The two hydraulic rods 42 are controlled by signals respectively.

[0056] During microbial culture, the pH value of the fermentation broth is crucial and needs to be controlled within a suitable range. When the pH sensor 410 detects that the pH value is outside the suitable range, it feeds back the detected value to the control terminal. The control terminal then activates the hydraulic rod 42. When the pH value is too low, the hydraulic rod 42 corresponding to the feeding pipe 41 containing the alkaline solution is activated. The hydraulic rod 42 pulls the feeding pipe 41 upward, causing the round rod 47 and the second bevel gear 46 to move upward, so that the second bevel gear 46 engages with the first bevel gear. When the first bevel gear 45 meshes with the second bevel gear 46, the drive motor 31 is started, which drives the rotating shaft 32 and the first bevel gear 45 to rotate one revolution. At the same time, the round rod 47 drives the rubber block 48 to rotate one revolution, which discharges the alkaline solution inside the storage tank 49 through the outlet 44. Then, the hydraulic rod 42 pushes the feeding pipe 41 downward, which separates the second bevel gear 46 and the first bevel gear 45. At this time, the drive motor 31 is started again to stir the fermentation liquid inside the culture tank 1, so that the alkaline solution is fully mixed with the fermentation liquid and the pH value of the fermentation liquid is within a suitable range.

[0057] Usage: Start the drive motor 31 to drive the rotating shaft 32 to rotate. The rotating shaft 32 synchronously drives the two first stirring blades 33 to rotate. The first stirring blades 33 drive the C-shaped rod 39 and the second stirring blade 36 to rotate through the connecting rotating shaft 315. At the same time, the contact rod 313 rotates. The contact rod 313 slides along the inner side of the ring 35. When the contact rod 313 contacts the inclined surface of the triangular plate 34, the contact rod 313 will move towards the rotating shaft 32, causing the rectangular frame 310 to move horizontally as a whole. After the contact rod 313 passes the triangular plate 34, under the elastic force of the spring 314, the contact rod 313 and the inner side of the ring 35 are in contact with each other. This allows the drive shaft 312 to push the drive frame 311 to swing back and forth, causing the C-shaped rod 39 to rotate around the connecting rotating shaft 315. Thus, the C-shaped rod 39 drives the second stirring blade 36 to swing back and forth, which can effectively improve the stirring range.

[0058] When the rotating shaft 32 rotates, it synchronously drives the first gear 372 to rotate. The first gear 372 drives another first gear 372 to rotate via the synchronous belt 373. The first gear 372 drives the disc 371 to rotate via the support shaft 379. The disc 371 drives multiple arc-shaped racks 376 to rotate. The arc-shaped racks 376 drive the second gear 374 to rotate at a certain angle, which in turn drives the third gear 377 to rotate via the transmission shaft 375. The third gear 377 drives the ring 35 to rotate a certain distance via the ring rack 378, causing multiple triangular plates 34 to rotate. By changing the position, the oscillation position of the second stirring blade 36 can be changed. When the next arc-shaped rack 376 meshes with the second gear 374, the second gear 374 will continue to rotate. However, the length of the arc-shaped rack 376 is different, which causes the rotation angle of the second gear 374 and the third gear 377 to change. This changes the distance that the ring rack 378 drives the ring 35 and the triangular plate 34 to move. As a result, the distance that the triangular plate 34 moves each time is different, and the oscillation position of the second stirring blade 36 inside the fermentation liquid is not fixed each time, thereby further expanding the range of stirring of the fermentation liquid.

[0059] The two tilting plates 381 rotate, pushing the fermentation liquid at the bottom upwards and towards the second stirring blade 36, thus agitating the fermentation liquid at the bottom. At the same time, the required oxygen is supplied into the air inlet pipe 385. The oxygen enters the air distribution pipe 383 and is sprayed out through the air outlet 384. The oxygen enters the fermentation liquid and forms small bubbles. The rotation of the tilting plates 381 agitates the bubbles, making them stay in the fermentation liquid for a longer time. Meanwhile, the beating of the second stirring blade 36 breaks large bubbles into smaller ones, increasing the contact area between oxygen and microorganisms in the fermentation liquid, shortening the microbial culture cycle, and improving the culture efficiency.

[0060] The above description is merely a preferred embodiment of the present invention; however, the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A microbial inoculant culture device, comprising a culture tank (1), a sealing cover (2) is threadedly connected to the top of the culture tank (1), an electromagnetic valve (5) is arranged at the bottom of the culture tank (1), characterized in that: The upper surface of the sealing cap (2) is provided with a stirring assembly (3) for stirring the culture medium. The stirring assembly (3) includes a drive motor (31) fixed to the upper surface of the sealing cover (2) and a ring (35) slidably disposed on the inner surface of the culture tank (1). A triangular plate (34) is fixedly connected to the inner side of the ring (35). A rotating shaft (32) is fixedly connected to the output end of the drive motor (31). A first stirring blade (33) is symmetrically connected to the outer surface of the rotating shaft (32). A connecting shaft (315) is rotatably connected inside the first stirring blade (33). The two ends of the rotating shaft (315) are fixedly connected to the C-shaped rod (39), the bottom of the C-shaped rod (39) is fixedly connected to the second stirring blade (36), the top of the C-shaped rod (39) is fixedly connected to the drive frame (311), the drive shaft (312) is slidably connected inside the drive frame (311), the two sides of the drive shaft (312) are fixedly connected to the rectangular frame (310), and the two sides of the rectangular frame (310) are respectively fixedly connected to the contact rod (313) and the spring (314). One side of the spring (314) is fixedly connected to the outer surface of the rotating shaft (32), and the other side of the contact rod (313) is in contact with the inclined surface of the triangular plate (34). The two sides of the connecting rotating shaft (315) extend into the interior of the first stirring blade (33). The shaped rod (39) is sleeved on the outer surface of the first stirring blade (33). The rectangular frame (310) is provided with a limiting rod on the side near the spring (314), and the limiting rod extends into the interior of the rotating shaft (32) and slides against each other. The spring (314) is sleeved on the outer surface of the limiting rod. The number of triangular plates (34) is odd. A pitch-changing assembly (37) is provided on one side of the upper surface of the sealing cover (2). A material-turning assembly (38) is provided at the bottom of the culture tank (1).

2. The microbial inoculant cultivation device according to claim 1, characterized in that: The variable pitch assembly (37) includes a support shaft (379) that rotates at the edge of the upper surface of the sealing cover (2), a drive shaft (375) that rotates inside the sealing cover (2), and an annular rack (378) fixed to the top of the ring (35). The outer surface of the support shaft (379) and the outer surface of the rotating shaft (32) are fixedly connected to a first gear (372). The outer surfaces of the two first gears (372) are fitted with a timing belt (373). The top of the support shaft (379) is fixedly connected to a disc (371). The outer surface of the disc (371) is fixedly connected to a plurality of arc-shaped racks (376). The top of the drive shaft (375) is fixedly connected to a second gear (374). The bottom of the drive shaft (375) is fixedly connected to a third gear (377).

3. The microbial inoculant cultivation device according to claim 2, characterized in that: The top of the drive shaft (375) extends into the interior of the sealing cover (2), the third gear (377) meshes with the ring rack (378), the second gear (374) and the disk (371) are at the same horizontal height, and the arc rack (376) and the second gear (374) mesh with each other.

4. The microbial inoculant cultivation device according to claim 3, characterized in that: Four arc-shaped racks (376) are provided, each with a different length, and each arc-shaped rack (376) meshes with the second gear (374).

5. The microbial inoculant cultivation device according to claim 4, characterized in that: The material turning assembly (38) includes an air inlet pipe (385) fixed to the bottom of the culture tank (1) and two material turning plates (381) fixed to the outer surface of the rotating shaft (32) near the bottom. A slot (382) is provided in the middle of the bottom of the material turning plate (381). An air distribution pipe (383) is fixedly connected to the top of the air inlet pipe (385). Multiple air outlets (384) are provided on the outer surface of the air distribution pipe (383).

6. The microbial inoculant cultivation device according to claim 5, characterized in that: The air distribution pipe (383) is located inside the slot (382), the turning plate (381) is at a 45-degree angle to the horizontal, the bottom of the turning plate (381) is in contact with the bottom of the culture tank (1), and the outer surface of the air inlet pipe (385) is provided with a heat insulation layer.

7. The microbial inoculant cultivation device according to claim 1, characterized in that: Adjustment components (4) are provided on both sides of the top of the sealing cover (2). The adjustment components (4) include a mounting plate (411) fixedly connected to the top of the sealing cover (2), a first bevel gear (45) fixedly fixed to the outer surface of the rotating shaft (32), and a pH sensor (410) fixedly fixed to the inner surface of the culture tank (1). A hydraulic rod (42) is fixedly connected to the bottom of the mounting plate (411). A feeding pipe (41) is fixedly connected to the output end of the hydraulic rod (42). A circular frame (43) is fixedly connected to the bottom of the feeding pipe (41). An outlet (44) is opened on the outer surface of the circular frame (43). A rubber block (48) is rotatably connected inside the circular frame (43). A storage trough (49) is opened on the outer surface of the rubber block (48). A round rod (47) is fixedly connected to one side of the rubber block (48). A second bevel gear (46) is fixedly connected to one side of the round rod (47).

8. The microbial inoculant cultivation device according to claim 7, characterized in that: The feeding tube (41) is located inside the sealing cover (2), and the feeding tube (41) and the sealing cover (2) slide against each other. One side of the round rod (47) extends out of the interior of the round frame (43), and the first bevel gear (45) and the second bevel gear (46) mesh with each other.

9. A microbial inoculant cultivation device according to claim 8, characterized in that: The inner top of the feeding tube (41) is fitted with a sealing plug. The interior of the feeding tube (41) is connected to the interior of the circular frame (43). The two hydraulic rods (42) are controlled by signals respectively.

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