Self-cleaning type double-shaft stirring fermentation tank and self-cleaning evaluation method thereof

Abstract

The invention relates to the technical field of stirring fermentation, in particular to a self-cleaning type double-shaft stirring fermentation tank and a self-cleaning evaluation method of the self-cleaning type double-shaft stirring fermentation tank. The self-cleaning type double-shaft stirring fermentation tank comprises a tank body, a tank cover, a heat preservation isolation layer, a double-shaft stirring crushing assembly and a self-cleaning assembly. The heat preservation isolation layer is used for maintaining the temperature of the tank body stable and is arranged on the tank body, the double-shaft stirring and crushing assembly is arranged on the tank cover, and the self-cleaning assembly is in transmission with the double-shaft stirring and crushing assembly; the fermentation tank has the beneficial effects that the internal temperature of the tank body is continuously kept by utilizing the heat-preservation isolation layer, so that the stability of the fermentation process is ensured; the vortex is formed in the stirring and crushing process, so that the materials are fully mixed and crushed, and the fermentation efficiency is improved; through stirring in the fermentation process, the fermentation speed is increased, and meanwhile the fermentation completion degree can be improved; and the tank body after fermentation can be effectively and automatically cleaned, so that an operation procedure without manual cleaning is realized, and the standard uniformity of self-cleaning operation is improved.

Description

Technical Field

[0001] The invention relates to the technical field of stirring fermentation, and more particularly to a self-cleaning double-shaft stirring fermentation tank and a self-cleaning evaluation method thereof. Background Art

[0002] Fermentation tanks are widely used in many industries such as fine chemicals, bioengineering, food, beverages, and pharmaceuticals. They are indispensable equipment in the process of microbial fermentation. They provide a suitable external environment for the growth, reproduction, and formation of metabolites of microorganisms, and have functions such as sterilization, heat preservation, and stirring and crushing to promote the growth of microorganisms and the smooth progress of the fermentation process.

[0003] The existing fermentation tanks have the following problems during use: first, materials are easily accumulated in the tank, which not only affects the fermentation effect, but also may breed bacteria, resulting in a decrease in product quality. At present, most cleaning methods are manual disassembly and cleaning or the use of external cleaning equipment, which is time-consuming and labor-intensive, and there is a problem of incomplete cleaning;

[0004] Secondly, the stirring and crushing mechanism of the existing fermentation tanks mostly uses a single stirring paddle to stir, resulting in uneven mixing of the materials; and for some larger fermentation products or fibrous materials, it is difficult for traditional fermentation tanks to achieve effective and standardized crushing. The main reason is that fibrous materials are prone to uneven shear fracture and fiber bundle agglomeration. During the stirring and crushing process of larger fermentation products, the crushing energy efficiency is insufficient, resulting in excessive crushing particle size, resulting in the fermentation effect in the entire fermentation tank not being standardized and unified, and the fermentation effect being unstable. Summary of the invention

[0005] The purpose of the present invention is to provide a self-cleaning double-axis stirred fermentation tank and its self-cleaning evaluation method, which can perform bidirectional stirring during the fermentation process and can perform self-cleaning after the fermentation process is completed, and evaluate the performance adaptability of the self-cleaning process of the fermentation tank.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A self-cleaning double-shaft stirring fermentation tank comprises a tank body, a tank cover, a heat-insulating isolation layer, a double-shaft stirring and crushing assembly and a self-cleaning assembly. The tank cover is detachably connected to the upper end of the tank body. The heat-insulating isolation layer is used to maintain the temperature of the tank body stable and is arranged on the tank body. The double-shaft stirring and crushing assembly is arranged on the tank cover. The self-cleaning assembly is driven by the double-shaft stirring and crushing assembly, and the self-cleaning assembly can clean the inner wall of the tank body.

[0008] The described tank body includes a tank shell, a strip-shaped observation window, fixed ends, locking bolts, rotating fastening columns, tank body expansion interfaces, and expansion port baffles. A strip-shaped observation window is provided on the tank shell. Multiple fixed ends are circumferentially distributed on the tank cover. Locking bolts are respectively connected to the multiple fixed ends through threads. The rotating fastening column is connected to the locking bolt through threads. The tank body expansion interfaces are symmetrically arranged in a mirror image on the left and right sides of the tank shell. Two expansion port baffles are both provided on the tank shell. The two tank body expansion interfaces are both communicated with the tank shell. The two expansion port baffles are respectively used to protect the corresponding tank body expansion interfaces. A sewage outlet is provided at the bottom of the tank shell.

[0009] Preferably, the self-cleaning component includes a water pump, a connecting pipe, a side wall cleaning pipe, a cleaning pipe, a limiting slider, a fixed end plate, a spring, a closing movable plate, a limiting track, a nozzle connecting pipe, and a high-speed nozzle. The output end of the water pump is fixedly connected to the connecting pipe. Multiple limiting sliders are fixedly connected to the cleaning pipe. The fixed end plate is slidably connected to the cleaning pipe. A spring is provided between the fixed end plate and the closing movable plate. The closing movable plate is slidably connected to the tank cover. The fixed end plate is fixedly connected to the tank cover. The cleaning pipe is slidably connected to the closing movable plate. Multiple limiting tracks are respectively provided on multiple nozzle connecting pipes. Multiple nozzle connecting pipes are all rotatably connected to the cleaning pipe. A water inlet groove is provided at the bottom of the cleaning pipe. Multiple high-speed nozzles are respectively provided on multiple nozzle connecting pipes. A rotating shaft is provided on the side of multiple high-speed nozzles away from the nozzles. The cleaning pipe can rotate around the axis of the tank shell. When the cleaning pipe rotates around, multiple high-speed nozzles all rotate around the corresponding rotating shafts. The side wall cleaning pipe is located above the area formed by the fixed end plate and the closing movable plate.

[0010] Preferably, multiple nozzles are provided on the high-speed nozzle. The multiple nozzles are arranged in multiple columns and multiple rows. The planes of each column of nozzles are arranged at an angle of 45° to each other. The planes of each row of nozzles are arranged at an angle of 30°.

[0011] Preferably, the tank cover includes a tank cover, a locking fixed end, a material adding cover, an expansion joint, a water pump fixed end, an observation window on the tank cover, and a commutator fixed end. Multiple locking fixed ends are provided on the tank cover. The multiple locking fixed ends are respectively slidably connected to multiple locking bolts. A material adding port is provided on the tank cover. Multiple expansion joints are provided. The multiple expansion joints are all provided on the tank cover. S-shaped bent pipes are provided at the bottoms of the multiple expansion joints. The water pump fixed end, the observation window on the tank cover, and the commutator fixed end are all provided on the tank cover. The closing movable plate is fixedly connected to the tank cover. Multiple limiting columns are provided on the tank cover. The multiple limiting columns are respectively slidably connected to the corresponding limiting tracks. A water injection cavity is formed between the fixed end plate and the closing movable plate and the tank cover.

[0012] Preferably, the biaxial stirring and crushing assembly includes a driving motor, a protective housing, a transmission gear, a driven gear set, a linkage bevel gear, an outer shaft driving gear, an outer shaft, an inner shaft and crushing blades. The driving motor is arranged on the protective housing, the protective housing is arranged on the fixed end of the commutator, the transmission gear is fixedly sleeved on the output shaft of the driving motor, the transmission gear meshes and drives with the driven gear set, the driven gear set meshes and drives with the linkage bevel gear, the linkage bevel gear meshes and drives with the outer shaft driving gear, the outer shaft is fixedly connected to the bottom of the outer shaft driving gear, the inner shaft is fixedly connected to the bottom of the driven gear set, the inner shaft is located in the outer shaft, and a plurality of crushing blades are arranged at the bottoms of both the outer shaft and the inner shaft.

[0013] Preferably, the linkage bevel gear is connected to the water pump through a one-way coupling. The one-way coupling includes a water pump drive shaft coupling, an outer one-way bearing ring, an inner one-way bearing ring, wedges and a transmission gear shaft. The water pump drive shaft coupling is fixedly connected to the water pump, the water pump drive shaft coupling is fixedly connected to the outer one-way bearing ring, the outer one-way bearing ring is slidably connected to the inner one-way bearing ring, a plurality of wedges are arranged between the outer one-way bearing ring and the inner one-way bearing ring, and the inner one-way bearing ring is fixedly connected to the transmission gear shaft.

[0014] Preferably, a plurality of one-way limiting grooves are arranged between the outer one-way bearing ring and the inner one-way bearing ring. The plurality of one-way limiting grooves are all arc-shaped, and the spacing of the plurality of one-way limiting grooves increases sequentially in the clockwise direction.

[0015] Preferably, the plurality of crushing blades include crushing pieces and pipes, and pipes are processed inside the plurality of crushing blades located at the bottom of the inner shaft.

[0016] Preferably, the heat preservation and isolation layer includes a heat preservation outer cover, a water level observation window for the heat preservation layer, an electric heating rod interface, fermentation tank support legs, a heating protruding layer and a water injection port. The heat preservation outer cover is arranged on the outer side of the tank body, the water level observation window for the heat preservation layer is arranged on the heat preservation outer cover, a plurality of fermentation tank support legs are arranged at the bottom of the heat preservation outer cover, two heating protruding layers are arranged at the bottom of the heat preservation outer cover, two electric heating rod interfaces are arranged on the two heating protruding layers, and two water injection ports are arranged on the upper side of the heat preservation outer cover.

[0017] Preferably, for a method for evaluating the self-cleaning of the tank body of a self-cleaning biaxial stirring fermentation tank, before the self-cleaning component is used to perform the self-cleaning process on the tank body, according to the elastic coefficient K of the spring, the relative moving distance X between the closing movable plate and the fixed end plate, and the maximum water storage area A formed by the closing movable plate and the fixed end plate spring , calculate the power required for the driving motor during the cleaning process, so as to complete the evaluation process of the adaptation relationship between the self-cleaning component and the tank body. The specific process is as follows:

[0018] Step 1: Add fermented materials through the material addition cover. When feeding the materials, start the double-shaft stirring and crushing assembly to make the crushing blades rotate. The rotation speed is much lower than that during the raw material crushing process. Then, feed the strains through the S-shaped bending pipe on the expansion joint. After that, inject water through the two water injection ports until the water completely fills the thermal insulation outer cover. The water level can be observed through the water level observation window of the thermal insulation layer. By inserting electric heating rods into the two electric heating rod interfaces, the water in the thermal insulation outer cover can be heated until the temperature reaches the specified temperature requirement;

[0019] Step 2: After the temperature reaches the requirement, start the double-shaft stirring and crushing assembly in the forward direction to make the crushing blades rotate. However, the rotation speed is much lower than that during the raw material crushing process, and the raw materials can be stirred bidirectionally;

[0020] Step 3: After the fermentation is completed, open the valve set on the sewage discharge port at the bottom of the tank body. The fermented substances during the cleaning process are discharged through the sewage discharge port. By starting the double-shaft stirring and crushing assembly in the reverse direction, the bevel gear rotates, driving the connected transmission gear shaft to rotate. There are multiple one-way limiting grooves between the outer ring and the inner ring of the one-way bearing, which will make the outer ring and the inner ring of the one-way bearing rotate synchronously. The water pump is externally connected to a water source and is driven by the water pump to pump water in, generating two water paths. One path flows into the double-shaft stirring and crushing assembly through the connecting pipe to clean the bottom of the tank body through the double-shaft stirring and crushing assembly. The other water path enters between the fixed end plate and the closed movable plate through the side wall cleaning pipe. Since water is continuously pumped in, the water volume between the fixed end plate and the closed movable plate increases, and the pressure increases, pushing the closed movable plate to move together with the cleaning pipe. During the movement, the spring is stretched. As the cleaning pipe moves, multiple limiting sliders slide into the tank cover. When the multiple limiting sliders stop sliding, the cleaning pipe stops sliding. Then, the closed movable plate continues to be pushed by the water pressure to move until the closed movable plate and the fixed end plate form a water storage area that includes the water inlet groove of the cleaning pipe. At this time, the water stored between the closed movable plate and the fixed end plate flows into the cleaning pipe, and the water flow can flow from the cleaning pipe into multiple high-speed nozzles, and then the multiple high-speed nozzles spray water to clean the inner wall of the tank body;

[0021] Step 4: When the support drive motor starts in the reverse direction, the transmission gear rotates, driving the engaged driven gear set to rotate, making the bevel gear rotate, and then driving the outer shaft drive gear to rotate, driving the outer shaft to rotate. The driven gear set rotates to drive the inner shaft to rotate. The inner shaft is connected to the connecting pipe, and water is pumped into the inner shaft through the connecting pipe. Then, the water flows from the inner shaft into the cleaning pipes in the multiple crushing pieces, and the water flows out with the rotation of the multiple crushing pieces to complete the cleaning process of the bottom of the tank body, thus finally completing the comprehensive cleaning work of the inner side of the tank body.

[0022] The beneficial effects of the present invention are:

[0023] 1. By putting raw materials into the tank body from the tank lid and using the heat preservation and isolation layer to continuously maintain the internal temperature of the tank body, it is beneficial to ensure the stability of the fermentation process;

[0024] 2. It can heat the temperature required for different fermentation processes by inserting heating rods into the heat preservation and isolation layer, and can adapt to a variety of fermentation environments. During the fermentation process, by starting the double-shaft stirring and crushing component, the raw materials input for fermentation can be stirred and crushed, increasing the comprehensiveness of fermentation and effectively preventing incomplete fermentation. The two stirring shafts of the double-shaft stirring and crushing component are provided with crushing blades in different directions and angles, which can form a vortex during the stirring and crushing process, making the materials fully mixed and crushed, and improving the fermentation efficiency;

[0025] 3. During the fermentation process, by starting the double-shaft stirring and crushing component, the crushing blades rotate, but the rotation speed is much lower than the process of crushing raw materials, which can stir the raw materials in two directions, making the raw materials and fermentation additives more evenly and tightly combined, improving the fermentation speed and the completion degree of fermentation at the same time;

[0026] 4. After fermentation, by starting the double-shaft stirring and crushing component in reverse, the double-shaft stirring and crushing component rotates in reverse, which can drive the self-cleaning component to start, guide clear water into the double-shaft stirring and crushing component, and the imported clear water flows out from the bottom of the double-shaft stirring and crushing component to clean the bottom of the tank body. At the same time, the self-cleaning component can, under the drive of the double-shaft stirring and crushing component, clean the inner wall of the tank body by the self-cleaning component, effectively automatically cleaning the tank body after fermentation, increasing the use efficiency and cleaning efficiency.

[0027] 5. Through this self-cleaning evaluation method, it can effectively test the relationship between the set self-cleaning component and the tank body, and can make corresponding quantitative adaptive adjustments to the corresponding insufficient components according to the evaluation degree, ensuring that the cleaning performance of the subsequent self-cleaning is in a corresponding adaptation state with the tank body, and can carry out a quantitative matching evaluation process for the self-cleaning performance of the existing fermentation tank body and the fermentation tank body to be built. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following further describes the present invention in detail with reference to the drawings and specific implementation methods.

[0029] Figure 1 is the overall structural schematic diagram of the present invention;

[0030] Figure 2 is the structural schematic diagram of the tank body of the present invention;

[0031] Figure 3 is the structural schematic diagram of the tank lid of the present invention;

[0032] Figure 4Another perspective of the structural schematic diagram of the can lid of the present invention;

[0033] Figure 5 It is of the present invention Figure 4 Enlarged schematic diagram at position B;

[0034] Figure 6 Structural sectional view of the heat insulation and isolation layer of the present invention;

[0035] Figure 7 Structural schematic diagram of the tank body and the dual-shaft stirring and crushing assembly of the present invention;

[0036] Figure 8 Structural schematic diagram of the dual-shaft stirring and crushing assembly of the present invention;

[0037] Figure 9 Structural schematic diagram of the can lid and the dual-shaft stirring and crushing assembly of the present invention;

[0038] Figure 10 Structural schematic diagram of the one-way coupling of the present invention;

[0039] Figure 11 Structural sectional view of the crushing blade of the present invention;

[0040] Figure 12 Structural schematic diagram of the self-cleaning assembly of the present invention;

[0041] Figure 13 It is of the present invention Figure 12 Enlarged schematic diagram at position A;

[0042] Figure 14 Partial structural schematic diagram of the self-cleaning assembly of the present invention;

[0043] Figure 15 Partial structural schematic diagram of the high-speed nozzle of the present invention.

[0044] In the figure: tank body 1; tank cover 2; thermal insulation layer 3; double-axis stirring and crushing assembly 4; self-cleaning assembly 5; tank body 11; strip observation window 12; fixed end 13; locking bolt 14; tank body expansion interface 15; expansion opening baffle 16; tank cover body 21; locking fixed end 22; material adding cover 23; expansion joint 24; water pump fixed end 25; observation window 26 on tank cover; commutator fixed end 27; limit column 28; thermal insulation cover 31; thermal insulation layer water level observation window 32; electric heating rod interface 33; fermentation tank support leg 34; heating protrusion layer 35; water injection port 36; drive motor 41; protective shell 42; transmission gear 43; driven Gear set 44; linkage bevel gear 45; outer shaft driving gear 46; outer shaft 47; inner shaft 48; crushing blade 49; crushing piece 491; pipeline 492; water pump 51; connecting pipeline 52; side wall cleaning pipeline 53; cleaning pipeline 54; limiting slider 55; fixed end plate 56; spring 57; closed movable plate 58; limiting track 59; nozzle connecting pipe 510; high-speed nozzle 5111; water pump drive shaft coupling 511; one-way bearing outer ring 512; one-way bearing inner ring 5121; wedge block 5122; transmission gear shaft 513; nozzle 5112; rotating buckle column 141; water inlet trough 541; limiting groove 211. DETAILED DESCRIPTION

[0045] Specific implementation method 1: Combination Figure 1-14 The present embodiment is described. In the present embodiment, a self-cleaning double-shaft stirring fermentation tank comprises a tank body 1, a tank cover 2, a heat-insulating isolation layer 3, a double-shaft stirring and crushing component 4 and a self-cleaning component 5. The tank cover 2 is detachably connected to the upper end of the tank body 1. The heat-insulating isolation layer 3 is used to maintain the temperature of the tank body 1 stable and is arranged on the tank body 1. The double-shaft stirring and crushing component 4 is arranged on the tank cover 2. The self-cleaning component 5 is driven by the double-shaft stirring and crushing component 4. The self-cleaning component 5 can clean the inner wall of the tank body 1, and can put raw materials into the tank body 1 through the tank cover 2, and then use the heat-insulating isolation layer 3 to adjust the temperature inside the tank body 1. The continuous maintenance is conducive to ensuring the stability of the fermentation process. The heating rod can be inserted into the heat-insulating layer 3 to heat the temperature required for different fermentation processes, and it can adapt to a variety of fermentation environments. During the fermentation process, by starting the double-axis stirring and crushing component 4, the raw materials put into the fermentation can be stirred and crushed, thereby increasing the comprehensiveness of the fermentation and effectively preventing the existence of incomplete fermentation. The two stirring shafts of the double-axis stirring and crushing component 4 are provided with crushing blades in different directions and angles, and the vortex formed during the stirring and crushing process can fully mix and crush the materials, thereby improving the fermentation efficiency.

[0046] During the fermentation process, by starting the double-shaft stirring and crushing assembly 4, the crushing blades rotate, but the rotation speed is much lower than that during the raw material crushing process. It can stir the raw materials bidirectionally, enabling the raw materials and fermentation additives to be more evenly and tightly combined, improving the fermentation speed and the completion degree of fermentation at the same time;

[0047] After fermentation, by reversely starting the double-shaft stirring and crushing assembly 4, the double-shaft stirring and crushing assembly 4 rotates in reverse, which can drive the self-cleaning assembly 5 to start, and divert clear water into the double-shaft stirring and crushing assembly 4. The introduced clear water flows out from the bottom of the double-shaft stirring and crushing assembly 4 to clean the bottom of the tank body 1. At the same time, the self-cleaning assembly 5 can be driven by the double-shaft stirring and crushing assembly 4 to clean the inner wall of the tank body 1, effectively automatically cleaning the tank body 1 after fermentation, increasing the use efficiency and cleaning efficiency. Specific Embodiment 2:

[0049] This embodiment is a further limitation of Specific Embodiment 1. In this embodiment, the tank body 1 includes a tank body 11, a strip-shaped observation window 12, a fixed end 13, a lock bolt 14, a rotating fastening column 141, a tank body expansion interface 15, and an expansion port baffle 16. A strip-shaped observation window 12 is provided on the tank body 11. A plurality of fixed ends 13 are circumferentially and evenly distributed on the tank cover 2. A lock bolt 14 is respectively connected to each of the plurality of fixed ends 13 by a thread. The rotating fastening column 141 is connected to the lock bolt 14 by a thread. The tank body expansion interfaces 15 are symmetrically arranged on the left and right sides of the tank body 11 in a mirror image. Two expansion port baffles 16 are both provided on the tank body 11. The two tank body expansion interfaces 15 are both communicated with the tank body 11. The two expansion port baffles 16 are respectively used to protect the corresponding tank body expansion interfaces 15. A sewage outlet is provided at the bottom of the tank body 11;

[0050] The strip-shaped observation window 12 can monitor the process of adding materials in the tank body 11 and also view the changes occurring during the fermentation process, such as volume expansion, color change, etc. The tank body 11 and the tank cover 2 can be installed through the lock bolt 14. The specific installation process is as follows: By respectively rotating a plurality of rotating fastening columns 141, the lock bolt 14 is fastened on the tank cover 2, and then rotating the fastening column 141 in the reverse direction can complete the fixation of the tank cover 2.

[0051] The tank body expansion interfaces 15 are symmetrically distributed on the left and right sides of the tank body for adapting to different experimental channels, such as installing detection devices such as temperature sensors and pH sensors. During fermentation, due to the stirring, the fermentation raw materials may interfere with the devices externally connected to the tank body expansion interfaces 15. Therefore, setting the expansion port baffles 16 can effectively ensure the detection accuracy of the detection devices.

[0052] Embodiment 3: This embodiment is a further limitation of Embodiment 1 or 2. In this embodiment, the self-cleaning component 5 includes a water pump 51, a connecting pipe 52, a side wall cleaning pipe 53, a cleaning pipe 54, a limiting slider 55, a fixed end plate 56, a spring 57, a closing movable plate 58, a limiting track 59, a nozzle connecting pipe 510, and a high-speed nozzle 5111. The output end of the water pump 51 is fixedly connected to the connecting pipe 52. A plurality of limiting sliders 55 are fixedly connected to the cleaning pipe 54. The fixed end plate 56 is slidably connected to the cleaning pipe 54. The closing movable plate 58 is slidably connected to the tank cover 2. The fixed end plate 56 is fixedly connected to the tank cover 2. The cleaning pipe 54 is slidably connected to the closing movable plate 58. A plurality of limiting tracks 59 are respectively arranged on a plurality of nozzle connecting pipes 510. A plurality of nozzle connecting pipes 510 are all rotatably connected to the cleaning pipe 54. An inlet water tank 541 is arranged at the bottom of the cleaning pipe 54. A plurality of high-speed nozzles 5111 are respectively arranged on a plurality of nozzle connecting pipes 510;

[0053] When the cleaning pipe 54 rotates, a plurality of high-speed nozzles 5111 all rotate around the corresponding rotation axes. The side wall cleaning pipe 53 is located above the area formed by the fixed end plate 56 and the closing movable plate 58. When cleaning the tank body 11, the water pump 51 is driven by the double-shaft stirring and crushing component 4 to produce the effect of pumping water flow into the connecting pipe 52;

[0054] After the water flow is pumped in, two water paths are generated. One water path flows from the connecting pipe 52 into the double-shaft stirring and crushing component 4 to clean the bottom of the tank body 11 through the double-shaft stirring and crushing component 4. The other water path enters between the fixed end plate 56 and the closing movable plate 58 through the side wall cleaning pipe 53. Due to the continuous pumping of water, the water volume between the fixed end plate 56 and the closing movable plate 58 increases and the pressure increases, pushing the closing movable plate 58 to move together with the cleaning pipe 54. During the movement, the spring 57 is stretched. As the cleaning pipe 54 moves, a plurality of limiting sliders 55 slide into the tank cover body 21. When the plurality of limiting sliders 55 stop sliding, the cleaning pipe 54 stops sliding. Then, the closing movable plate 58 continues to be pushed by the water pressure to move until the closing movable plate 58 and the fixed end plate 56 form a water storage area to enclose the inlet water tank 541 of the cleaning pipe 54. At this time, the water stored between the closing movable plate 58 and the fixed end plate 56 flows into the cleaning pipe 54, and the water flow can flow from the cleaning pipe 54 into a plurality of high-speed nozzles 5111, and then a plurality of high-speed nozzles 5111 spray water to clean the inner wall of the tank body 11, completing the cleaning process of the inner wall and the bottom of the tank body 11;

[0055] During the movement of the cleaning pipeline 54, since a rotating shaft is provided on the side of the plurality of high-speed nozzles 5111 away from the nozzle, the cleaning pipeline 54 can rotate around the axis of the tank body 11. Subsequently, the movement will cause the plurality of limit tracks 59 to be restricted by the limit posts 28 correspondingly provided on the tank cover 2. Under the restriction of the corresponding limit posts 28, the plurality of limit tracks 59 drive the connected nozzle connecting pipes 510 to rotate around the rotating shaft. When the cleaning pipeline 54 stops moving, the high-speed nozzles 5111 are fully screwed out to perform the cleaning work on the inner wall of the tank body 11;

[0056] Furthermore, a plurality of nozzles 5112 are fixedly connected to the high-speed nozzles 5111, and the plurality of nozzles 5112 are arranged in multiple columns and rows. The planes of each column of nozzles 5112 are arranged at an angle of 45° to each other, and the planes of each row of nozzles 5112 are arranged at an angle of 30°. When the plurality of high-speed nozzles 5111 spray water, the spraying direction can ensure that each jet can cover an inner wall surface of the tank body 11 of about 90°. Combining the arrangement of the plurality of high-speed nozzles 5111 can achieve full coverage of the inner wall surface of the tank body 11, increase the cleaning range, and ensure the cleaning completion degree.

[0057] Specific Embodiment 4: This embodiment is a further limitation of Specific Embodiment 1, 2 or 3. In this embodiment, the tank cover 2 includes a tank cover body 21, a lock fixing end 22, a material adding cover 23, an expansion joint 24, a water pump fixing end 25, an observation window 26 on the tank cover and a commutator fixing end 27. A plurality of lock fixing ends 22 are provided on the tank cover body 21, and the plurality of lock fixing ends 22 are respectively slidably connected with a plurality of lock bolts 14. A material adding port 23 is provided on the tank cover body 21. A plurality of expansion joints 24 are provided, and the plurality of expansion joints 24 are all provided on the tank cover body 21. S-shaped bent pipes are provided at the bottoms of the plurality of expansion joints 24. The water pump fixing end 25, the observation window 26 on the tank cover and the commutator fixing end 27 are all provided on the tank cover body 21. A closing movable plate 58 is fixedly connected to the tank cover body 21. A plurality of limit posts 28 are provided on the tank cover body 21, and the plurality of limit posts 28 are respectively slidably connected with the corresponding limit tracks 59. A sealed space is formed between the fixed end plate 56, the closing movable plate 58 and the tank cover body 21;

[0058] The plurality of expansion joints 24 are respectively used to adapt to different fermentation process requirements. The expansion joints 24 can be flexibly used to adapt to different types of experimental channels, such as temperature measurement, pH measurement, material taking, etc. The S-shaped bent pipes provided on the expansion joints 24 can reduce the contact area between the strains and the air during the feeding process, reduce the risk of contamination by miscellaneous bacteria in the air; guide the strains to enter the fermentation tank along a specific path, slow down the descending speed and impact force of the strains, and better protect the activity of the strains. The material adding cover 23 is used to add fermentation materials, and the observation window 26 on the tank cover is used to observe the material feeding.

[0059] Specific Embodiment 5: This embodiment is a further limitation of Specific Embodiments 1, 2, 3, or 4. In this embodiment, the double-shaft stirring and crushing assembly 4 includes a driving motor 41, a protective housing 42, a transmission gear 43, a driven gear set 44, a linkage bevel gear 45, an outer shaft driving gear 46, an outer shaft 47, an inner shaft 48, and crushing blades 49. The driving motor 41 is arranged on the protective housing 42, the protective housing 42 is arranged on the fixed end 27 of the commutator, the transmission gear 43 is fixedly sleeved on the output shaft of the driving motor 41, the transmission gear 43 is meshed with the driven gear set 44 for transmission, the driven gear set 44 is meshed with the linkage bevel gear 45 for transmission, the linkage bevel gear 45 is meshed with the outer shaft driving gear 46 for transmission, the outer shaft 47 is fixedly connected to the bottom of the outer shaft driving gear 46, the inner shaft 48 is fixedly connected to the bottom of the driven gear set 44, the inner shaft 48 is located in the outer shaft 47, and a plurality of crushing blades 49 are arranged at the bottoms of both the outer shaft 47 and the inner shaft 48. The plurality of crushing blades 49 on the outer shaft 47 and the plurality of crushing blades 49 at the bottom of the inner shaft 48 are arranged in different directions and angles;

[0060] The protective housing 42 is used to support the driving motor 41 and protect the transmission gear 43, the driven gear set 44, the linkage bevel gear 45, and the outer shaft driving gear 46. It supports the driving motor 41 to start the rotation of the transmission gear 43, drives the driven gear set 44 meshed therewith to rotate, makes the linkage bevel gear 45 rotate, and then drives the outer shaft driving gear 46 to rotate, drives the outer shaft 47 to rotate. The rotation of the driven gear set 44 drives the inner shaft 48 to rotate. The rotation directions of the inner shaft 48 and the outer shaft 47 are opposite. Therefore, the rotation directions of the plurality of crushing blades 49 on the outer shaft 47 and the plurality of crushing blades 49 on the inner shaft 48 are opposite, producing the effect of double-direction stirring to improve the stirring uniformity.

[0061] Specific Embodiment 6: This embodiment is a further limitation of Specific Embodiments 1, 2, 3, 4, or 5. In this embodiment, the linkage bevel gear 45 is connected to the water pump 51 through a one-way coupling. The one-way coupling includes a water pump drive shaft coupling 511, a one-way bearing outer ring 512, a one-way bearing inner ring 5121, wedges 5122, and a transmission gear shaft 513. The water pump drive shaft coupling 511 is fixedly connected to the water pump 51, the water pump drive shaft coupling 511 is fixedly connected to the one-way bearing outer ring 512, the one-way bearing outer ring 512 is slidably connected to the one-way bearing inner ring 5121, a plurality of wedges 5122 are arranged between the one-way bearing outer ring 512 and the one-way bearing inner ring 5121, and the one-way bearing inner ring 5121 is fixedly connected to the transmission gear shaft 513;

[0062] The linkage bevel gear 45 rotates, driving the connected transmission gear shaft 513 to rotate. There are multiple one-way limiting grooves provided between the outer ring 512 of the one-way bearing and the inner ring 5121 of the one-way bearing. All of the multiple one-way limiting grooves are arc-shaped. Along the clockwise direction, the spacing of the one-way limiting grooves increases. In the case of the forward rotation of the linkage bevel gear 45, the forward rotation is set such that the projection direction from the coupling direction to the water pump 51 direction is clockwise. Since the spacing of the one-way limiting grooves increases from small to large along the clockwise direction, when the outer ring 512 of the one-way bearing and the inner ring 5121 of the one-way bearing rotate relative to each other, the wedge block 5122 will be restricted by the one-way limiting grooves. Under the action of friction, it will cause the outer ring 512 of the one-way bearing and the inner ring 5121 of the one-way bearing to rotate together, enabling the driving of the water pump 51, and thus generating the effect of cleaning and pumping water. When the linkage bevel gear 45 rotates in reverse, the wedge block 5122 will move to the position where the spacing of the one-way limiting grooves is large, and it will not restrict the relative rotation of the outer ring 512 of the one-way bearing and the inner ring 5121 of the one-way bearing. At this time, water will not be pumped in when the double-shaft stirring and crushing assembly 4 is stirring or crushing, increasing the working mode of the device and facilitating the automatic control of the cleaning part.

[0063] Specific Embodiment Seven: This embodiment is a further limitation of Specific Embodiments One, Two, Three, Four, Five, or Six. The multiple crushing blades 49 include crushing pieces 491 and pipes 492. Pipes 492 are machined inside each of the multiple crushing blades 49 located at the bottom of the inner shaft 48 and are connected to the connecting pipe 52 through the inner shaft 48 to pump water into the inner shaft 48. Then, the water enters the pipes 492 in the multiple crushing pieces 491 from the inner shaft 48, and the water sprays out from the pipes 492 and rotates with the multiple crushing pieces 491, capable of cleaning the bottom of the tank body 11.

[0064] Specific Embodiment Eight: This embodiment is a further limitation of Specific Embodiments One, Two, Three, Four, Five, Six, or Seven. In this embodiment, the heat-insulating and isolating layer 3 includes a heat-insulating outer cover 31, a heat-insulating layer water level observation window 32, an electric heating rod interface 33, a fermentation tank support leg 34, a heating protruding layer 35, and a water injection port 36. The heat-insulating outer cover 31 is arranged on the outer side of the tank body 11. The heat-insulating layer water level observation window 32 is arranged on the heat-insulating outer cover 31. Multiple fermentation tank support legs 34 are all arranged at the bottom of the heat-insulating outer cover 31. Two heating protruding layers 35 are both arranged at the bottom of the heat-insulating outer cover 31. Two electric heating rod interfaces 33 are arranged on the two heating protruding layers 35. Two water injection ports 36 are both arranged on the upper side of the heat-insulating outer cover 31;

[0065] Water is injected through the two water injection ports 36 until the heat-insulating outer cover 31 is completely filled with water. The water level can be observed through the heat-insulating layer water level observation window 32. By inserting electric heating rods into the two electric heating rod interfaces 33, the water inside the heat-insulating outer cover 31 can be heated until the temperature reaches the specified temperature requirement.

[0066] Embodiment 9: This embodiment is a further limitation of Embodiments 1, 2, 3, 4, 5, 6, 7 or 8. In this embodiment, a self-cleaning evaluation method for a self-cleaning double-shaft stirring fermentation tank is provided. The self-cleaning evaluation method for the self-cleaning double-shaft stirring fermentation tank completes a continuous self-cleaning fermentation process by switching between stirring fermentation and self-cleaning operations. Specifically:

[0067] Step 1: Add fermentation materials through the material addition cover 23. When adding materials, start the double-shaft stirring and crushing assembly 4 to make the crushing blades 49 rotate. The rotation speed is much lower than that during the raw material crushing process. Then, add strains through the S-shaped bending pipe on the expansion joint 24. After that, inject water through the two water injection ports 36 until the water completely fills the heat preservation outer cover 31. The water level can be observed through the heat preservation layer water level observation window 32. By inserting electric heating rods into the two electric heating rod interfaces 33, the water in the heat preservation outer cover 31 can be heated until the temperature reaches the specified temperature requirement.

[0068] Step 2: After the temperature reaches the requirement, start the double-shaft stirring and crushing assembly 4 in the forward direction to make the crushing blades 49 rotate. However, the rotation speed is much lower than that during the raw material crushing process, and the raw materials can be stirred bidirectionally.

[0069] Step 3: After the fermentation is completed, open the valve set on the sewage outlet at the bottom of the tank body 11. The fermented substances during the cleaning process are discharged from the sewage outlet. By reversely starting the double-shaft stirring and crushing assembly 4, the linkage bevel gear 45 rotates, driving the connected transmission gear shaft 513 to rotate. There are multiple one-way limiting grooves between the outer ring 512 of the one-way bearing and the inner ring 5121 of the one-way bearing, which will cause the outer ring 512 of the one-way bearing and the inner ring 5121 of the one-way bearing to rotate synchronously. The water pump 51 is externally connected to a water source. Driven by the water pump 51, water flows in, generating two water paths. One path flows into the double-shaft stirring and crushing assembly 4 through the connecting pipe 52, and the double-shaft stirring and crushing assembly 4 is used to clean the bottom of the tank body 11. The other water path enters between the fixed end plate 56 and the closed movable plate 58 through the side wall cleaning pipe 53. Since water continues to be pumped in, the water volume between the fixed end plate 56 and the closed movable plate 58 increases, and the pressure increases, pushing the closed movable plate 58 to move together with the cleaning pipe 54. During the movement, the spring 57 is stretched. As the cleaning pipe 54 moves, multiple limiting sliders 55 slide into the tank cover body 21. The tank cover body 21 is provided with multiple limiting grooves 211, and the multiple limiting sliders 55 are respectively slidably connected in the multiple limiting grooves 211. When the multiple limiting sliders 55 stop sliding, the cleaning pipe 54 stops sliding. Then, the closed movable plate 58 continues to be pushed by the water pressure to move until the closed movable plate 58 and the fixed end plate 56 form a water storage area that includes the water inlet groove 541 of the cleaning pipe 54. At this time, the water stored between the closed movable plate 58 and the fixed end plate 56 flows into the cleaning pipe 54, and the water flow can flow from the cleaning pipe 54 into the multiple high-speed nozzles 5111, and then the multiple high-speed nozzles 5111 spray water to clean the inner wall of the tank body 11;

[0070] Step 4: When the support drive motor 41 reversely starts, the transmission gear 43 rotates, driving the driven gear set 44 meshing with it to rotate, causing the linkage bevel gear 45 to rotate, and then driving the outer shaft drive gear 46 to rotate, driving the outer shaft 47 to rotate. The driven gear set 44 rotates to drive the inner shaft 48 to rotate. The inner shaft 48 is connected and communicated with the connecting pipe 52. Water flow is pumped into the inner shaft 48 by the connecting pipe 52, and then the water flow enters the pipe 492 in the multiple crushing pieces 491 from the inner shaft 48. The water flow sprays out from the pipe 492 and rotates with the multiple crushing pieces 491 to complete the cleaning process of the bottom of the tank body 11, thereby finally completing the all-round cleaning work of the inner side of the tank body 11;

[0071] Specific Embodiment Ten: This embodiment is a further limitation of Specific Embodiment Nine.

[0072] Before using the self-cleaning assembly 5 to realize the self-cleaning process of the tank body 1, according to the elastic coefficient K of the spring 57, the relative moving distance X between the closed movable plate 58 and the fixed end plate 56, and the maximum water storage area A formed between the closed movable plate 58 and the fixed end plate 56 spring, the power of the driving motor 41 for the cleaning process needs to be calculated, so as to complete the evaluation process of the adaptation relationship between the self-cleaning component 5 and the tank body 1. The specific process is as follows:

[0073] Conduct a resistance analysis on the self-cleaning process, and specifically calculate through the following formula:

[0074] S1. System resistance analysis: After the water flow is pumped into the water storage area between the closing movable plate 58 and the fixed end plate 56, the resistance received by the spring 57 is: F spring = K * X, which is converted into hydraulic pressure:

[0075] Pipeline friction resistance: Calculate the frictional resistance along the connecting pipeline 52 and the side wall cleaning pipeline 53 respectively: In the formula: λ is the pipeline friction coefficient, L is the pipeline length in m, D is the pipeline diameter in m, ρ is the water density in kg / m 3 , v is the flow velocity in m / s;

[0076] S2. Flow rate demand calculation, when the top nozzle unfolds with the instantaneous flow rate: Q piston = A piston ·V piston , in the formula: V piston The relative moving speed of the closing movable plate 58 and the fixed end plate 56 in m / s;

[0077] Total flow rate of the nozzles 5112: Q top = N top ·q top , in the formula: N top is the number of nozzles 5112, q top is the flow rate of a single top nozzle 5112 in m 3 / s;

[0078] Total flow rate of the pipeline 492 ports: Q bottom = N bottom ·q bottom , in the formula: N bottom is the number of pipeline 492 ports in the bottom crushing blade 49, q bottom is the flow rate of the pipeline 492 ports in the bottom crushing blade 49 in m 3 / s;

[0079] Total flow rate: Q total = Q piston + Q top + Q bottom ;

[0080] S3. Drive motor 41 power calculation and transmission efficiency analysis: The mechanical transmission path from the drive motor 41 to the water pump 51 mainly includes the transmission of the transmission gear 43, the driven gear set 44, the linkage bevel gear 45 and the outer shaft drive gear 46, as well as the one-way coupling. The total transmission efficiency is the product of the efficiencies of each component: η tran = η gear ·η bearing , where: η tran is the total transmission efficiency, η gear is the transmission efficiency of the transmission gear 43, the driven gear set 44, the linkage bevel gear 45 and the outer shaft drive gear 46, η gear ≈0.97, and the transmission efficiency of the one-way coupling η bearing ≈0.93;

[0081] System efficiency of the water pump 51: The water pump 51 contains hydraulic and volumetric losses. Let η pump be the system efficiency of the water pump 51, and η pump ranges from 0.6 to 0.8, and the reverse power of the motor;

[0082] For the drive self-cleaning system to operate normally, the theoretical power when the drive motor 41 rotates in reverse is:

[0083] S4. Redundant design actual efficiency requirement, where: η tran ranges from 15% to 20%;

[0084] According to the elastic coefficient K of the spring 57, the relative moving distance X between the closing movable plate 58 and the fixed end plate 56, and the maximum water storage area A formed by the closing movable plate 58 and the fixed end plate 56 spring are all constants. According to the above calculation process, the actual power of the motor is finally calculated to see if it is between 15% and 20%. If it is within this range, the equipment used is in excellent working conditions for the self-cleaning component 5.

[0085] The working principle of the present invention is:

[0086] Add fermented materials through the material addition cover 23. When feeding materials, start the double-shaft stirring and crushing assembly 4, so that the crushing blades rotate, but the rotation speed is much lower than that during the raw material crushing process, which can stir the raw materials bidirectionally, making the raw materials and fermentation additives more evenly and tightly combined, improving the fermentation speed and the fermentation completion degree at the same time. The strain is fed through the S-shaped bending pipe on the expansion joint 24, and the S-shaped bending pipe can reduce the impact force of the strain input. Then, water is injected through the two water injection ports 36 until the water completely fills the heat preservation outer cover 31. The water level can be observed through the heat preservation layer water level observation window 32. By inserting electric heating rods into the two electric heating rod interfaces 33, the water in the heat preservation outer cover 31 can be heated until the temperature reaches the specified temperature requirement, and then the fermentation work is carried out. During the fermentation process, start the double-shaft stirring and crushing assembly 4, so that the crushing blades rotate, but the rotation speed is much lower than that during the raw material crushing process, which can stir the raw materials bidirectionally, making the raw materials and fermentation additives more evenly and tightly combined, improving the fermentation speed and the fermentation completion degree at the same time. After the fermentation is completed, open the valve set on the sewage outlet, and the sewage outlet discharges the fermented substances during the cleaning process. Then, reverse-start the double-shaft stirring and crushing assembly 4, and the double-shaft stirring and crushing assembly 4 rotates in reverse, which can drive the self-cleaning assembly 5 to start, guiding clean water into the double-shaft stirring and crushing assembly 4. The introduced clean water flows out from the bottom of the double-shaft stirring and crushing assembly 4 to clean the bottom of the tank body 1. When the double-shaft stirring and crushing assembly 4 starts, the linkage bevel gear 45 rotates, driving the connected transmission gear shaft 513 to rotate. There are multiple one-way limiting grooves between the outer ring 512 of the one-way bearing and the inner ring 5121 of the one-way bearing. Since the spacing of the one-way limiting grooves increases from small to large along the clockwise direction, when the outer ring 512 of the one-way bearing and the inner ring 5121 of the one-way bearing rotate relative to each other, the wedge block 5122 will be restricted by the one-way limiting grooves. Under the action of friction, the outer ring 512 of the one-way bearing and the inner ring 5121 of the one-way bearing will rotate together, which can drive the water pump 51. After the water is pumped in, two water paths are generated. One flows into the double-shaft stirring and crushing assembly 4 through the connecting pipe 52, and the double-shaft stirring and crushing assembly 4 cleans the bottom of the tank body 11. The other water path enters between the fixed end plate 56 and the closed movable plate 58 through the side wall cleaning pipe 53. Since water is continuously pumped in, the water volume between the fixed end plate 56 and the closed movable plate 58 increases, and the pressure increases, pushing the closed movable plate 58 to move together with the cleaning pipe 54. During the movement, the spring 57 is stretched. As the cleaning pipe 54 moves, multiple limiting sliders 55 slide into the tank cover body 21. When the multiple limiting sliders 55 stop sliding, the cleaning pipe 54 stops sliding. Then, the closed movable plate 58 continues to be pushed by the water pressure to move until the closed movable plate 58 and the fixed end plate 56 form a water storage area to enclose the water inlet groove 541 of the cleaning pipe 54. At this time, the water stored between the closed movable plate 58 and the fixed end plate 56 flows into the cleaning pipe 54.The water flow can flow from the cleaning pipeline 54 into the multiple high-speed nozzles 5111, and then the multiple high-speed nozzles 5111 spray water to clean the inner wall of the tank body 11, completing the cleaning process of the inner wall and bottom of the tank body 11. During the movement of the cleaning pipeline 54, since a rotating shaft is provided on the side of the multiple high-speed nozzles 5111 far away from the nozzles, the cleaning pipeline 54 can rotate around the axis of the tank body 11. As it moves, the multiple limit tracks 59 will be restricted by the limit posts 28 correspondingly arranged on the tank cover 2. Under the restriction of the corresponding limit posts 28, the multiple limit tracks 59 drive the connected nozzle connecting pipes 510 to rotate around the rotating shaft. When the cleaning pipeline 54 stops moving, the high-speed nozzles 5111 are fully rotated out to clean the inner wall of the tank body 11. When the linkage bevel gear 45 rotates reversely, the wedge block 5122 will move to the position where the distance between the one-way restriction slots is large, and will not restrict the relative rotation of the outer ring 512 and the inner ring 5121 of the one-way bearing. At this time, water will not be pumped in when the double-shaft stirring and crushing assembly 4 is stirring or crushing. After the water is pumped in, two water paths are generated. One flows from the connecting pipeline 52 into the double-shaft stirring and crushing assembly 4 to clean the bottom of the tank body 11 through the double-shaft stirring and crushing assembly 4. The other water path enters between the fixed end plate 56 and the closed movable plate 58 through the side wall cleaning pipeline 53. Since water is continuously pumped in, the water volume between the fixed end plate 56 and the closed movable plate 58 increases and the pressure increases, pushing the closed movable plate 58 to move together with the cleaning pipeline 54. During the movement, the spring 57 is stretched. As the cleaning pipeline 54 moves, the multiple limit sliders 55 slide into the tank cover body 21. When the multiple limit sliders 55 stop sliding, the cleaning pipeline 54 stops sliding. Then the closed movable plate 58 continues to be pushed by the water pressure to move until the closed movable plate 58 and the fixed end plate 56 form a water storage area to enclose the water inlet groove 541 of the cleaning pipeline 54. At this time, the water stored between the closed movable plate 58 and the fixed end plate 56 flows into the cleaning pipeline 54, and the water flow can flow from the cleaning pipeline 54 into the multiple high-speed nozzles 5111, and then the multiple high-speed nozzles 5111 spray water to clean the inner wall of the tank body 11, completing the cleaning process of the inner wall and bottom of the tank body 11. During the movement of the cleaning pipeline 54, since a rotating shaft is provided on the side of the multiple high-speed nozzles 5111 far away from the nozzles, the cleaning pipeline 54 can rotate around the axis of the tank body 11. As it moves, the multiple limit tracks 59 will be restricted by the limit posts 28 correspondingly arranged on the tank cover 2. Under the restriction of the corresponding limit posts 28, the multiple limit tracks 59 drive the connected nozzle connecting pipes 510 to rotate around the rotating shaft. When the cleaning pipeline 54 stops moving, the high-speed nozzles 5111 are fully rotated out to clean the inner wall of the tank body 11. At the same time, the support drive motor 41 starts to drive the transmission gear 43 to rotate, driving the driven gear set 44 meshing with it to rotate, causing the linkage bevel gear 45 to rotate, and then driving the outer shaft drive gear 46 to rotate, driving the outer shaft 47 to rotate. The rotation of the driven gear set 44 drives the inner shaft 48 to rotate.The inner shaft 48 is connected to the connecting pipe 52. Water flow is pumped into the inner shaft 48 by the connecting pipe 52. Then, the water flow enters the pipe 492 in the plurality of broken pieces 491 from the inner shaft 48. The water flow is ejected from the pipe 492 and rotates with the plurality of broken pieces 491, enabling the bottom of the tank body 11 to be cleaned and completing the cleaning work of all positions inside the tank body 11.

Claims

1. A self-cleaning double-shaft stirring fermenter, characterized in that: The invention comprises a tank body (1), a tank cover (2), a heat-insulating isolation layer (3), a double-shaft stirring and crushing assembly (4) and a self-cleaning assembly (5); the tank cover (2) is detachably connected to the upper end of the tank body (1); the heat-insulating isolation layer (3) is used to maintain the temperature of the tank body (1) stable and is arranged on the tank body (1); the double-shaft stirring and crushing assembly (4) is arranged on the tank cover (2); the self-cleaning assembly (5) is driven by the double-shaft stirring and crushing assembly (4); and the self-cleaning assembly (5) can clean the inner wall of the tank body (1); The tank body (1) comprises a tank body (11), a strip-shaped observation window (12), a fixed end (13), a locking bolt (14), a rotating buckling column (141), a tank body expansion interface (15) and an expansion opening baffle (16); the tank body (11) is provided with a strip-shaped observation window (12); a plurality of fixed ends (13) are evenly distributed on the tank cover (2) in the circumferential direction; the plurality of fixed ends (13) are respectively connected with locking bolts (14) by threads; the rotating buckling column (141) is connected with the locking bolts (14) by threads; the tank body expansion interface (15) is arranged on the left and right sides of the tank body (11) in a mirror-symmetrical manner; two expansion opening baffles (16) are both arranged on the tank body (11); the two tank body expansion interfaces (15) are both connected to the tank body (11); the two expansion opening baffles (16) are respectively used to protect the corresponding tank body expansion interfaces (15); and a sewage outlet is arranged at the bottom of the tank body (11).

2. A self-cleaning double-shaft stirring fermenter according to claim 1, characterized in that: The self-cleaning component (5) comprises a water pump (51), a connecting pipe (52), a side wall cleaning pipe (53), a cleaning pipe (54), a limiting slider (55), a fixed end plate (56), a spring (57), a closed movable plate (58), a limiting rail (59), a nozzle connecting pipe (510) and a high-speed nozzle (5111). The output end of the water pump (51) is fixedly connected to the connecting pipe (52), and the cleaning pipe (54) is fixedly connected to a plurality of limiting sliders ( 55), a fixed end plate (56) is slidably connected to the cleaning pipe (54), a spring (57) is provided between the fixed end plate (56) and the closed movable plate (58), the closed movable plate (58) is slidably connected to the tank cover (2), the fixed end plate (56) is fixedly connected to the tank cover (2), the cleaning pipe (54) is slidably connected to the closed movable plate (58), a plurality of limiting rails (59) are respectively provided on a plurality of nozzle connecting pipes (510), and the plurality of nozzle connecting pipes (510) The cleaning pipe (54) is rotatably connected to the tank body (11). A water inlet tank (541) is provided at the bottom of the cleaning pipe (54). The plurality of high-speed nozzles (5111) are respectively provided on the plurality of nozzle connecting pipes (510). A rotation axis is provided on the side of the plurality of high-speed nozzles (5111) away from the nozzles. The cleaning pipe (54) can rotate around the axis of the tank body (11). When the cleaning pipe (54) rotates, the plurality of high-speed nozzles (5111) rotate around the corresponding rotation axis. A water injection chamber is formed between the fixed end plate (56) and the closed movable plate (58) and the tank cover (2); the side wall cleaning pipe (53) is located on the upper side of the water injection chamber and is used to inject water into the side wall cleaning pipe (53); the high-speed nozzle (5111) is provided with a plurality of nozzles (5112), and the plurality of nozzles (5112) are arranged in a plurality of columns and rows, and the planes of the nozzles (5112) in each column are arranged at 45 degrees to each other, and the planes of the nozzles (5112) in each row are arranged at 30 degrees to each other.

3. A self-cleaning double-shaft stirring fermenter according to claim 2, characterized in that: The tank cover (2) comprises a tank cover body (21), a lock fixing end (22), a material adding cover (23), an expansion joint (24), a water pump fixing end (25), an observation window (26) on the tank cover and a commutator fixing end (27). The tank cover body (21) is provided with a plurality of lock fixing ends (22), and the plurality of lock fixing ends (22) are respectively slidably connected to a plurality of lock bolts (14). The material adding port (23) is provided on the tank cover body (21). A plurality of expansion joints (24) are provided, and the plurality of expansion joints (24) are all provided on the tank cover body (21). The bottoms of the plurality of expansion joints (24) are all provided with An S-shaped curved pipe, a water pump fixed end (25), an observation window (26) on the tank cover, and a commutator fixed end (27) are all arranged on the tank cover body (21), a closed movable plate (58) is fixedly connected to the tank cover body (21), a plurality of limiting columns (28) are arranged on the tank cover body (21), the plurality of limiting columns (28) are respectively slidably connected to corresponding limiting rails (59), a water injection cavity is formed between the fixed end plate (56) and the closed movable plate (58) and the tank cover body (21), a plurality of limiting grooves (211) are arranged on the tank cover body (21), and a plurality of limiting sliders (55) are respectively slidably connected to the plurality of limiting grooves (211).

4. A self-cleaning double-shaft stirring fermenter according to claim 3, characterized in that: The double-shaft stirring and crushing assembly (4) comprises a driving motor (41), a protective shell (42), a transmission gear (43), a driven gear set (44), a linkage bevel gear (45), an outer shaft driving gear (46), an outer shaft (47), an inner shaft (48) and a crushing blade (49), wherein the driving motor (41) is arranged on the protective shell (42), the protective shell (42) is arranged on the commutator fixed end (27), and the transmission gear (43) is solidly mounted on the output shaft of the driving motor (41). The transmission gear (43) is meshed with the driven gear set (44) for transmission, the driven gear set (44) is meshed with the linkage bevel gear (45) for transmission, the linkage bevel gear (45) is meshed with the outer shaft driving gear (46) for transmission, the outer shaft (47) is fixedly connected to the bottom of the outer shaft driving gear (46), the inner shaft (48) is fixedly connected to the bottom of the driven gear set (44), the inner shaft (48) is sleeved in the outer shaft (47), and a plurality of crushing blades (49) are arranged at the bottom of the outer shaft (47) and the bottom of the inner shaft (48).

5. A self-cleaning double-shaft stirring fermenter according to claim 4, characterized in that: The linkage bevel gear (45) is connected to the water pump (51) via a one-way coupling. The one-way coupling comprises a water pump drive shaft coupling (511), a one-way bearing outer ring (512), a one-way bearing inner ring (5121), a wedge (5122) and a transmission gear shaft (513). The water pump drive shaft coupling (511) is fixedly connected to the water pump (51). The water pump drive shaft coupling (511) is fixedly connected to the one-way bearing outer ring (512). The one-way bearing outer ring (512) is slidably connected to the one-way bearing inner ring (5121). A plurality of wedges (5122) are arranged between the one-way bearing outer ring (512) and the one-way bearing inner ring (5121). The one-way bearing inner ring (5121) is fixedly connected to the transmission gear shaft (513).

6. A self-cleaning double-shaft stirring fermenter according to claim 5, characterized in that: A plurality of one-way limiting grooves are arranged between the one-way bearing outer ring (512) and the one-way bearing inner ring (5121), and the plurality of one-way limiting grooves are all arc-shaped, and the spacing between the one-way limiting grooves increases along the clockwise direction.

7. The self-cleaning double-shaft stirring fermenter according to claim 3, characterized in that: The multiple crushing blades (49) include crushing pieces (491) and pipes (492), and the multiple crushing blades (49) located at the bottom of the inner shaft (48) are all processed with pipes (492) inside.

8. The self-cleaning double-shaft stirring fermenter according to claim 1, characterized in that: The thermal insulation layer (3) comprises a thermal insulation outer cover (31), a thermal insulation layer water level observation window (32), an electric heating rod interface (33), a fermentation tank support leg (34), a heating protruding layer (35) and a water injection port (36); the thermal insulation outer cover (31) is arranged on the outside of the tank body (11); the thermal insulation layer water level observation window (32) is arranged on the thermal insulation outer cover (31); a plurality of fermentation tank support legs (34) are arranged at the bottom of the thermal insulation outer cover (31); two heating protruding layers (35) are arranged at the bottom of the thermal insulation outer cover (31); two electric heating rod interfaces (33) are arranged on the two heating protruding layers (35); and two water injection ports (36) are arranged on the upper side of the thermal insulation outer cover (31).

9. A self-cleaning evaluation method for a self-cleaning dual-shaft stirring fermenter, characterized in that: The method is implemented by using a self-cleaning biaxial stirring fermenter according to any one of claims 1 to 8, characterized in that: the self-cleaning evaluation method of the self-cleaning biaxial stirring fermenter completes a continuous self-cleaning fermentation process by switching stirring fermentation and self-cleaning operation, specifically: Step 1: Add fermentation materials through the material adding cover (23). When adding materials, start the double-axis stirring and crushing assembly (4) to rotate the crushing blades (49). The rotation speed is much lower than the raw material crushing process. Then, the strain is added through the S-shaped curved pipe on the expansion joint (24). After that, water is injected through the two water injection ports (36) until the water completely fills the insulation cover (31). The water level can be observed through the insulation layer water level observation window (32). By inserting electric heating rods into the two electric heating rod interfaces (33), the water in the insulation cover (31) can be heated until the temperature reaches the specified temperature requirement; Step 2: After the temperature reaches the required level, the dual-shaft stirring and crushing assembly (4) is started in the forward direction, so that the crushing blades (49) rotate, but the rotation speed is much lower than that in the raw material crushing process, so that the raw materials can be stirred in both directions; Step 3: After fermentation is completed, the valve provided on the sewage outlet at the bottom of the tank body (11) is opened, and the fermented material in the cleaning process is discharged from the sewage outlet. By reversely starting the double-shaft stirring and crushing assembly (4), the bevel gear (45) is linked to rotate, driving the transmission gear shaft (513) connected thereto to rotate. A plurality of one-way limiting grooves are provided between the one-way bearing outer ring (512) and the one-way bearing inner ring (5121), which will cause the one-way bearing outer ring (512) and the one-way bearing inner ring (5121) to rotate synchronously. The water pump (51) is connected to an external water source, and the water pump (51) is driven to pump water into the tank body (11). Two water paths are generated. One water path flows into the double-shaft stirring and crushing assembly (4) through the connecting pipe (52), and the bottom of the tank body (11) is cleaned through the double-shaft stirring and crushing assembly (4). The other water path enters between the fixed end plate (56) and the closed movable plate (58) through the side wall cleaning pipe (53). As water is continuously pumped in, the fixed end plate ( The amount of water between the closed movable plate (56) and the closed movable plate (58) increases, and the pressure increases, pushing the closed movable plate (58) to move together with the cleaning pipe (54). During the movement, the spring (57) is stretched, and as the cleaning pipe (54) moves, the plurality of limiting sliders (55) slide into the tank cover body (21). When the plurality of limiting sliders (55) stop sliding, the cleaning pipe (54) stops sliding, and then the closed movable plate (58) continues to be pushed and moved by the water pressure until the closed movable plate (58) and the fixed end plate (56) form a water storage area to cover the water inlet groove (541) of the cleaning pipe (54). At this time, the water stored between the closed movable plate (58) and the fixed end plate (56) flows into the cleaning pipe (54), and the water flow can flow from the cleaning pipe (54) into the plurality of high-speed nozzles (5111), and then the plurality of high-speed nozzles (5111) spray water to clean the inner wall of the tank body (11); Step 4: The driving motor (41) is started in reverse to rotate the transmission gear (43), which drives the driven gear set (44) meshing with it to rotate, so that the linkage bevel gear (45) rotates, and then drives the outer shaft driving gear (46) to rotate, drives the outer shaft (47) to rotate, and the driven gear set (44) rotates to drive the inner shaft (48) to rotate. The inner shaft (48) is connected to the connecting pipe (52), and water is pumped into the inner shaft (48) through the connecting pipe (52). Then, the water flows from the inner shaft (48) into the pipe (492) in the multiple crushing pieces (491). The water flows from the pipe (492) into the multiple crushing pieces (491) and is sprayed out as the multiple crushing pieces (491) rotate, completing the cleaning process of the bottom of the can body (11), thereby finally completing the all-round cleaning work of the inside of the can body (11).

10. The self-cleaning evaluation method according to claim 9, characterized in that: Before the self-cleaning process of the tank body (1) is carried out by using the self-cleaning component (5), the elastic coefficient K of the spring (57), the relative movement distance X between the closed movable plate (58) and the fixed end plate (56), and the maximum water storage area A formed by the closed movable plate (58) and the fixed end plate (56) are determined. spring , the power required for the driving motor (41) during the cleaning process is calculated, thereby completing the evaluation process of the adaptation relationship between the self-cleaning component (5) and the tank body (1), and the specific process is as follows: S1: Analysis of system resistance: After the water flow is pumped into the water storage area between the closed movable plate (58) and the fixed end plate (56), the resistance of the spring (57) is: F spring =K*X, converted to hydraulic pressure: The pipeline friction resistance is calculated by respectively calculating the resistance along the connecting pipeline (52) and the side wall cleaning pipeline (53) Where: λ is the pipeline friction coefficient, L is the pipeline length, D is the pipeline diameter, ρ is the water density, and v is the flow velocity; S2: Calculated according to traffic demand: Mobile instantaneous traffic: Q piston =A piston ·V piston , where: V piston The relative moving speed of the closed movable plate (58) and the fixed end plate (56); the total flow rate of the nozzle (5112): Q top =N top ·q top , where: N top is the number of nozzles (5112), the total flow rate at the pipe (492): Q bottom =N bottom ·q bottom , where: N bottom is the number of openings in the pipe (492) in the bottom crushing blade (49), q bottom is the flow rate at the outlet of the pipe (492) in the bottom crushing blade (49); total flow rate: Q total =Q piston +Q top +Q bottom ; S3: Calculate the power of the drive motor (41): Transmission efficiency analysis: The mechanical transmission path from the drive motor (41) to the water pump (51) mainly includes the transmission of the transmission gear (43), the driven gear set (44), the linkage bevel gear (45) and the external shaft drive gear (46) and the one-way coupling. The total transmission efficiency is the product of the efficiencies of each component: η tran =η gear ·η bearing , where: η tran is the total transmission efficiency, η gear is the transmission efficiency of the transmission gear (43), the driven gear set (44), the linkage bevel gear (45) and the external shaft driving gear (46), η bearing is the transmission efficiency of the one-way coupling, the system efficiency of the water pump (51): η pump is the system efficiency of the water pump (51), the motor reverse power: to drive the self-cleaning system to operate normally, the theoretical power of the driving motor (41) when it is reversed is: S4. Actual efficiency requirement of redundant design: P actual =P motor ·η tran , where: η tran The value is between 15% and 20%.

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