Agricultural biological amino acid selenium nutrient solution fermentation tank

Abstract

The invention relates to the technical field of fermentation devices, and particularly discloses an agricultural biological amino acid selenium nutrient solution fermentation tank which comprises a tank body, an inoculation device is arranged at the top of the tank body, the inoculation device comprises a mounting seat, the mounting seat is mounted at the top of the tank body, and a through hole communicating the inside and the outside of the tank body is formed in the middle of the mounting seat; the piston rod is installed in the through hole in a sliding mode, a flow guide groove is formed in the side, close to the outer side face of the tank body, of the piston rod, an opening in the bottom end of the flow guide groove is located in the bottom of the side face of the piston rod, a cap is arranged at the top end of the piston rod, and an annular air suction opening is formed in the edge of the bottom of the cap. Therefore, negative pressure is formed above the air flow channel, air enters the air suction opening from the outside, flames can be guided to the air suction opening to form an annular flame barrier, the stability of the flame barrier is guaranteed, the influence caused by external air flow disturbance can be reduced, and contamination of infectious microbes is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of fermentation devices, in particular to a bio-amino acid selenium nutrient solution fermentation tank for agriculture. Background Art

[0002] A liquid fermentation tank is a device that mixes various liquid culture materials in a specific ratio to create a liquid culture medium. After sterilization, the culture medium is then inoculated and fermented in the tank. It is primarily used in industry for microbial fermentation. The fermentation tank body is constructed of high-grade stainless steel, ensuring a precise concentration of liquid culture medium. An internal stirring device ensures uniform mixing of the materials, while a stirring paddle disperses and breaks up foam. This provides a high oxygen dissolution rate, excellent mixing, and promotes the fermentation reaction.

[0003] Chinese patent document CN109997619B discloses a liquid culture fermentation tank. The quick-opening feed port flange seat has a sealing notch with a sealing ring installed inside. The inoculation port's sealing cover is threadedly connected to the inoculation port, and a sealing gasket is installed inside the sealing cover. One end of the internal connecting pipe is connected to the filter element conduit via an upper hose quick connector, and the other end of the internal connecting pipe is connected to the lower filter cartridge. The internal conduit is connected to the filter element conduit via a lower hose quick connector and a hose. The front edge of the filter cartridge quick connector is provided with sealing grooves, and the front circumference of the sealing grooves is provided with sealing notches, and a sealing strip is installed inside the sealing grooves. The inner conduit's opening is oriented toward the tapered angle of the conical head, allowing the incoming air to blow and stir the sediment.

[0004] Fermentation tank inoculation is the core link of microbial fermentation, and its operation quality directly affects the fermentation efficiency and product purity. The commonly used inoculation methods are usually: fire ring inoculation method, syringe inoculation method and pressure differential inoculation method. The fire ring inoculation method is low-cost and simple to operate, but during the inoculation process, the open operation is easily affected by airflow disturbances, and the flame barrier may be broken, resulting in a higher chance of contamination by foreign bacteria. Summary of the Invention

[0005] The present invention provides a bio-amino acid selenium nutrient solution fermentation tank for agricultural use, aiming to solve the problem in the related art that the inoculation of bacterial flora using the fire ring inversion seeding method is easily affected by airflow disturbance and the flame barrier may be broken.

[0006] A bio-amino acid selenium nutrient solution fermentation tank for agricultural use, comprising a tank body, with an inoculation device provided on the top of the tank body, the inoculation device comprising: The mounting seat is mounted on the top of the tank body, and a through hole is opened in the middle thereof to communicate with the inside and outside of the tank body; The piston rod is slidably installed in the through hole, and a guide groove is provided on the side of the piston rod close to the outer side of the tank body. The bottom end opening of the guide groove is located at the bottom of the side of the piston rod. A cap is provided on the top of the piston rod, and an annular air suction port is provided at the bottom edge of the cap. An air flow channel connected to the air suction port is provided in the piston rod, and the bottom end opening of the air flow channel is located on the bottom surface of the piston rod. A magnetic piston block is provided in the air flow channel to slide up and down; The valve plate assembly is installed in the cap and closes the top opening of the flow channel when the piston rod moves upward; The support assembly includes a support rod, a push rod and a control mechanism for controlling the movement of the support rod installed in the tank body. When the piston rod rises to the maximum height, the support rod and the bottom of the piston rod are abutted. The push rod is fixedly installed in the tank body. When the piston rod drops to the lowest position, the push rod pushes the piston block to the top of the air flow channel.

[0007] The effect is that: during inoculation, alcohol cotton is placed in the annular groove and ignited to form a flame barrier, and then the cap is rotated to disengage it from the threaded sleeve. At the same time, the valve plate assembly closes the top opening of the air flow channel, and then the piston rod is pulled upward. Since the top opening of the air flow channel is closed, a negative pressure chamber is formed above the piston block, thereby preventing the piston block from falling relative to the piston rod. When the piston rod rises to the maximum height, the support assembly is against the bottom of the piston rod to fix the piston rod at this height. At the same time, the valve plate assembly opens the top opening of the air flow channel, and the piston block descends. Due to the action of the magnetic field, the piston block descends slowly and uniformly. The descent of the piston block causes the air suction port to suck air into the air flow channel, thereby guiding the flame to the air suction port to form an annular flame barrier. At this time, the mouth of the culture bottle is burned above the flame, and the bacterial liquid is quickly poured into the guide groove. Since the flame is guided by the air suction port, the airflow impact generated when the bottle mouth contacts the flame barrier can also be weakened, reducing the probability of contamination by miscellaneous bacteria.

[0008] Preferably, an annular sliding cavity is provided in the cap, and the valve plate assembly includes a retaining ring and a connecting rod installed in the sliding cavity from top to bottom. The connecting rod is fixedly connected to the retaining ring, and the connecting rod passes through the top of the cap to form a gripping portion. When the connecting rod is pulled upward, the retaining ring moves to the top of the sliding cavity, cutting off the connection between the airflow channel and its top opening.

[0009] Preferably, a spring is installed between the connecting ring and the cap to make the retaining ring descend and reset. The resistance encountered by the piston rod when moving upward relative to the mounting seat is greater than the maximum elastic force of the spring. When the spring is stretched to its maximum length, the retaining ring cuts off the connection between the airflow channel and its top opening, and then continues to pull upward to make the piston rod slide upward, thereby preventing the piston rod from moving upward when the retaining ring has not cut off the airflow channel.

[0010] Preferably, the diameter of the bottom portion of the piston rod is larger than the diameter of the upper portion thereof, so that the bottom portion of the piston rod forms a temporary storage cavity for storing bacterial liquid.

[0011] Preferably, a sleeve is fixedly connected to the bottom of the mounting seat, the bottom end of the sleeve is open, the piston rod and the sleeve are coaxially arranged, and when the piston rod rises to the maximum height, the bottom of the piston rod is sealed with the sleeve.

[0012] Preferably, the support rod is horizontally slidably installed at the bottom of the sleeve, and an elastic member is connected between the support rod and the sleeve for moving the support rod toward the bottom of the piston rod. When the piston block slides to the bottom end of the air flow channel, the control mechanism retracts the support rod.

[0013] Preferably, the control mechanism includes a push block slidably mounted on the bottom of the piston rod and a connecting rod 1 hinged to the bottom of the piston rod, a connecting rod 2 is hinged between the push block and the connecting rod 1, and the end of the connecting rod 1 away from the push block is located below the piston block.

[0014] Preferably, the upper surface of the mounting seat is provided with an annular groove which is concentric with the through hole. During inoculation, the operator first places the alcohol cotton in the annular groove and ignites it. The flame then burns in the annular groove to form a flame barrier. Then the piston rod rises and then falls, and the air suction port continuously draws in air through the air flow channel to guide the flame to the air suction port to form a stable annular flame barrier.

[0015] Preferably, the cap is rotatably mounted on the piston rod, and the cap is threadedly connected to the mounting seat.

[0016] Preferably, a sealing ring is provided above the through hole of the mounting seat, a thread is provided on the outer circumferential surface of the sealing ring, and a threaded sleeve cooperating with the sealing ring is provided at the bottom of the cap.

[0017] By adopting the above technical solution, the beneficial effects of the present invention are: 1. During the inoculation process, the piston moves downward in the air passage, thereby forming a negative pressure above the air passage. This allows air to enter the air inlet from the outside, thereby guiding the flame to the air inlet to form a ring-shaped flame barrier. This ensures the stability of the flame barrier, reduces the impact of external airflow disturbances, avoids contamination by bacteria, and improves fermentation efficiency and product purity. When the piston rod is lifted up, the support rod moves to the top of the sliding cavity, cutting off the connection between the air flow path and its top opening, and then the piston rod rises. Since the top opening of the air flow path is closed, a negative pressure cavity is formed above the piston block, causing the piston block to rise together with the piston rod. When the piston rod rises to its maximum height, the support rod moves toward the bottom of the piston rod under the action of the elastic member, thereby resisting the bottom of the piston rod to prevent the piston rod from falling, and the piston block descends in the air flow path, thereby forming a negative pressure above the air flow path, guiding the flame to the air suction port to form an annular flame barrier. After the inoculation is completed, when the piston block descends and resists the connecting rod 1, the connecting rod 1 rotates to cause the connecting rod 2 to drive the push block to push the support rod until the connecting rod 1 resists the bottom surface of the piston block. At this time, the support rod no longer resists the bottom of the piston rod, so that the piston rod falls under the action of its own gravity. This arrangement can conveniently control the lifting and lowering of the piston block, thereby automatically completing the suction function of the air suction port, and after the suction is completed, the piston rod automatically falls to avoid contact with the outside air. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of the present invention.

[0019] Figure 2 Schematic diagram of the structure of the inoculation device of the present invention.

[0020] Figure 3 2 is a cross-sectional view of the inoculation device of the present invention.

[0021] Figure 4 It is a structural schematic diagram of the present invention when the piston rod rises to the maximum height.

[0022] Figure 5 for Figure 4 Schematic diagram of the enlarged structure at point A in the middle.

[0023] Figure 6 Schematic diagram of the structure of the piston rod in the present invention.

[0024] Figure 7 It is a structural schematic diagram of the valve plate assembly in the present invention.

[0025] Reference numerals: 1. Inoculation device; 2. Mounting seat; 21. Annular groove; 22. Sealing ring; 23. Sleeve; 3. Piston rod; 31. Guide groove; 32. Temporary storage chamber; 33. Air flow channel; 34. Piston block; 35. Cover cap; 351. Air suction port; 352. Threaded sleeve; 4. Valve plate assembly; 41. Retaining ring; 42. Connecting rod; 43. Spring; 5. Support assembly; 51. Support rod; 511. Elastic member; 52. Push rod; 53. Control mechanism; 531. Push block; 532. Connecting rod one; 533. Connecting rod two. DETAILED DESCRIPTION

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0027] like Figure 1-Figure 7 As shown, a bio-amino acid selenium nutrient solution fermentation tank for agricultural use includes a tank body, a feed door, an exhaust valve and an inoculation device 1 are provided on the top of the tank body, a stirring device is provided inside the tank body, and a temperature control device is installed in the tank body for controlling the temperature inside the tank body.

[0028] The inoculation device 1 includes a mounting seat 2, a piston rod 3, a valve plate assembly 4 and a support assembly 5. The mounting seat 2 is fixedly mounted on the top of the tank body, and a through hole is opened in the middle to connect the inside and outside of the tank body. The upper surface of the mounting seat 2 is provided with an annular groove 21 concentric with the through hole. The annular groove 21 is used to place alcohol cotton. The piston rod 3 is slidably mounted in the through hole. A guide groove 31 is opened on the side of the piston rod 3 close to the outer side of the tank body. The diameter of the bottom of the piston rod 3 is larger than the diameter of the upper part thereof, so that a temporary storage chamber 32 for storing bacterial liquid is formed at the bottom of the piston rod 3. An opening is opened at the bottom of the temporary storage chamber 32 to communicate with the guide groove 31, so that the bacterial liquid enters the temporary storage chamber 32 along the guide groove 31. The bottom of the mounting seat 2 is fixedly connected to a sleeve 23 with an opening at the lower end. When the piston rod 3 is at the maximum height, the opening on the side of the temporary storage chamber 32 contacts the inner wall of the sleeve 23, so that The bacterial liquid is located in the temporary storage chamber 32, and a cap 35 is rotatably provided at the top of the piston rod 3. An annular air suction port 351 is provided at the bottom edge of the cap 35, and an air flow channel 33 connected to the air suction port 351 is provided in the piston rod 3. The bottom end opening of the air flow channel 33 is located at the bottom surface of the piston rod 3, and a magnetic piston block 34 (for example, made of neodymium iron boron) is provided in the air flow channel 33 to slide up and down. The valve plate assembly 4 is installed in the cap 35. When the piston rod 3 moves upward, the top opening of the air flow channel is closed. When the piston rod 3 rises to the maximum height, the support assembly 5 and the bottom of the piston rod 3 prevent the piston rod 3 from falling. The cap 35 is rotatably installed on the piston rod 3, and a sealing ring 22 is provided above the through hole of the mounting seat 2. The outer circumferential surface of the sealing ring 22 is provided with a thread, and the bottom of the cap 35 is provided with a threaded sleeve 352 that cooperates with the sealing ring 22 to form a sealed connection; During inoculation, alcohol cotton is placed in the annular groove 21 and ignited to form a flame barrier, and then the cap 35 is rotated to disengage it from the threaded sleeve 352. At the same time, the valve plate assembly 4 closes the top opening of the air flow channel, and then the piston rod 3 is pulled upward. Since the top opening of the air flow channel is closed, a negative pressure chamber is formed above the piston block 34, thereby preventing the piston block 34 from descending relative to the piston rod 3. When the piston rod 3 rises to the maximum height, the support assembly 5 is against the bottom of the piston rod 3, fixing the piston rod 3 at this height. At the same time, the valve plate assembly 4 opens the top opening of the air flow channel, and the piston block 34 descends. Since the piston block 34 is magnetic and the piston rod 3 is made of metal material (preferably copper alloy), the magnetic field of the piston block 34 passes through the piston rod 3, causing the magnetic flux in the piston rod 3 to change. According to Faraday's law of electromagnetic induction, an induced current will be generated in the metal tube. Therefore, the eddy current magnetic field will exert a resistance on the magnet in the opposite direction of its movement, causing the piston block 34 to slowly descend at a uniform speed. The descent of the piston block 34 causes the air suction port 351 to suck air into the air flow channel 33, thereby guiding the flame to the air suction port 351 to form an annular flame barrier. At this time, the mouth of the culture bottle is burned above the flame, and the bacterial liquid is quickly poured into the guide groove 31. Since the flame is guided by the air suction port 351, the airflow effect generated when the bottle mouth contacts the flame barrier can also be weakened, reducing the probability of contamination by miscellaneous bacteria. After the inoculation is completed, the piston block 34 slides to the bottom of the air flow channel 33, the support assembly 5 is retracted, and the piston rod 3 is lowered. Then, the cap 35 is tightened, the flame is extinguished, and the inoculation is completed.

[0029] The valve plate assembly 4 includes a retaining ring 41 and a connecting rod 42. An annular sliding cavity is provided in the cover 35. The inner and outer sides of the sliding cavity are respectively connected to the air inlet 351 and the air flow channel 33. The retaining ring 41 is installed in the sliding cavity up and down. The connecting rod 42 is fixedly connected to the retaining ring 41. The top end of the connecting rod 42 passes through the top of the cover 35 to form a gripping portion, and the connecting rod 42 and the cover 35 are slidably connected up and down. A limiting pin (not shown in the figure) is provided between the two to limit the rotation of the connecting rod 42 relative to the cover 35. The retaining pin 41 can slide when the hand holds the gripping portion. When the cavity is lifted and lowered and the connecting rod 42 is pulled upward, the retaining ring 41 moves to the top of the sliding cavity, cutting off the connection between the air flow channel and its top opening. A spring 43 is installed between the connecting ring and the cap 35 to make the retaining ring 41 descend and reset. The resistance encountered by the piston rod 3 when moving upward relative to the mounting seat 2 is greater than the maximum elastic force of the spring 43. When the spring 43 is stretched to its maximum length, the retaining ring 41 cuts off the connection between the air flow channel and its top opening, and then continues to pull upward to make the piston rod 3 slide upward, thereby preventing the piston rod 3 from moving upward when the retaining ring 41 has not cut off the air flow channel.

[0030] The support assembly 5 includes a support rod 51, a push rod 52 and a control mechanism 53. The support rod 51 is horizontally slidably mounted on the bottom of the sleeve 23, and a guiding inclined surface is provided at the bottom of the support rod 51. An elastic member 511 (the elastic member 511 is preferably a compression spring) is connected between the support rod 51 and the sleeve 23 to apply an elastic force to the support rod 51 in the direction of the piston rod 3. When the bottom of the piston rod 3 passes over the support rod 51, the support rod 51 abuts against the bottom of the piston rod 3, thereby preventing the piston rod 3 from descending. The push rod 52 is fixedly mounted in the tank body in a vertical state and is located directly below the air flow channel 33. When the bacterial liquid is completely poured into the temporary storage chamber 32, the control mechanism 53 retracts the support rod 51, thereby causing the piston rod 3 to descend. During the descending process of the piston rod 3, the push rod 52 abuts against the piston block 34, thereby causing the piston block 34 to move relative to the piston rod 3, and finally causing the piston block 34 to return to the top of the air flow channel 33.

[0031] The control mechanism 53 includes a push block 531, a connecting rod 1 532 and a connecting rod 2 533. The push block 531 is slidably mounted on the bottom of the piston rod 3. The connecting rod 1 532 is hinged to the bottom of the piston rod 3. The end of the connecting rod 1 532 away from the push block 531 is located below the piston block 34. The two ends of the connecting rod 2 533 are hinged to the push block 531 and the connecting rod 1 532 respectively. When the support rod 51 is against the bottom of the piston rod 3, the support rod 51 pushes the push block 531 so that the push block 531 is close to the air flow channel 3. 3, when the piston block 34 descends and abuts against the connecting rod 1 532, the connecting rod 1 532 rotates to cause the connecting rod 2 533 to drive the push block 531 to push the support rod 51 until the connecting rod 1 532 abuts against the bottom surface of the piston block 34. At this time, the support rod 51 no longer abuts against the bottom of the piston rod 3, so that the piston rod 3 descends under the action of its own gravity. At the same time, one end of the connecting rod 1 532 supports the piston block 34, thereby limiting the piston block 34 and preventing the piston block 34 from completely falling out of the air flow channel 33.

[0032] Example 1: The diameter of the air inlet 351 is 8 cm, the opening area is 5 cm², the cross-sectional area of ​​the air flow channel 33 is 18 cm², the descending speed of the piston block 34 is v, and the height of the air flow channel 33 is h=25 cm, then: The air flow rate at the air inlet 351 is u=(0.0018 / 0.0005)×v=3.2v; When v=0.04m / s, the air flow rate of the air suction port 351 is u=0.128m / s, and the inoculation time at this time is s=h / v=6.25s. At this time, it has a guiding effect on the top of the flame, avoiding gaps in the fluctuation of the top of the flame, and is sufficient for the inoculation operation.

[0033] Example 2: The diameter of the air inlet 351 is 10 cm, the opening area is 6.5 cm², the cross-sectional area of ​​the air passage 33 is 30 cm², the descending speed of the piston block 34 is v, and the height of the air passage 33 is h=25 cm, then: The air flow rate at the air inlet 351 is u=(0.003 / 0.00065)×v=4.6v; When v=0.05m / s, the air flow rate of the air suction port 351 is u=0.23m / s, and the inoculation time at this time is s=h / v=5s. At this time, the guiding effect of the flame is significantly enhanced, and there is enough time for inoculation.

[0034] The descending speed v of the piston block 34 is affected by the weight and material of the piston block 34 and the material of the piston rod 3; The diameter of the air suction port 351, the opening area, the cross-sectional area of ​​the air flow channel 33, the descending speed of the piston block 34, and the height of the air flow channel 33 are changed to change the air flow velocity u of the air suction port 351 to change the guiding effect on the flame.

[0035] The inoculation steps are as follows: Step 1: Place the alcohol cotton in the annular groove 21 and ignite it; Step 2: Rotate the cap 35 by the grip to disengage it from the threaded sleeve 352; Step 3: Pull the grip upwards to move the retaining ring 41 to the top of the sliding cavity, cutting off the connection between the air flow passage and its top opening, and then the piston rod 3 rises; Step 4: When the piston rod 3 rises to its maximum height, the support rod 51 moves toward the bottom of the piston rod 3 under the action of the elastic member 511, thereby contacting the bottom of the piston rod 3 to prevent the piston rod 3 from falling; Step 5: The piston block 34 descends in the air flow channel 33, thereby forming a negative pressure above the air flow channel 33, guiding the flame to the air suction port 351 to form an annular flame barrier; Step 6: Burn the mouth of the culture bottle above the flame, and quickly pour the culture liquid into the guide groove 31, and the culture liquid enters the temporary storage chamber 32; Step 7: When the piston block 34 descends and contacts the connecting rod 1 532, the connecting rod 1 532 rotates, causing the connecting rod 2 533 to drive the push block 531 to push the support rod 51 until the connecting rod 1 532 contacts the bottom surface of the piston block 34. At this point, the support rod 51 no longer contacts the bottom of the piston rod 3, and the piston rod 3 descends under its own gravity. The bacterial liquid in the temporary storage chamber 32 flows into the material in the tank and mixes with it. Step 8: Rotate the cap 35 by the gripping portion so that it engages with the threaded sleeve 352 to ensure sealing.

[0036] The fermenter not only improves the stability and safety during the inoculation process, but also greatly simplifies the operating steps and improves the inoculation efficiency. The guidance of the flame by the air suction port 351 ensures the stable existence of the flame barrier, effectively prevents the contamination of miscellaneous bacteria, and ensures the purity and fermentation efficiency of the fermentation product. In addition, the linkage between the piston rod 3, the valve plate assembly 4 and the support assembly 5 not only ensures the sealing during the inoculation process, but also realizes the lifting and lowering control of the position of the piston block 34 and the piston rod 3, which facilitates the smooth introduction of the bacterial liquid and then automatic closing.

[0037] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention.

Claims

1. A bio-amino acid selenium nutrient solution fermentation tank for agricultural use, comprising a tank body, an inoculation device (1) being provided on the top of the tank body, characterized in that: The inoculation device (1) comprises: A mounting seat (2), the mounting seat (2) is mounted on the top of the tank body, and a through hole is opened in the middle thereof to communicate with the inside and outside of the tank body; The piston rod (3) is slidably mounted in the through hole. A guide groove (31) is provided on one side of the piston rod (3) close to the outer side of the tank body. The bottom end opening of the guide groove (31) is located at the bottom of the side of the piston rod (3). A cap (35) is provided at the top of the piston rod (3). An annular air suction port (351) is provided at the bottom edge of the cap (35). An air flow channel (33) communicating with the air suction port (351) is provided in the piston rod (3). The bottom end opening of the air flow channel (33) is located at the bottom surface of the piston rod (3). A magnetic piston block (34) is provided in the air flow channel (33) to slide up and down. The valve plate assembly (4) is mounted in the cover cap (35) and closes the top opening of the flow channel when the piston rod (3) moves upward; The support assembly (5) includes a support rod (51) installed in the tank body, a push rod (52) and a control mechanism (53) for controlling the movement of the support rod (51). When the piston rod (3) rises to the maximum height, the support rod (51) abuts against the bottom of the piston rod (3). The push rod (52) is fixedly installed in the tank body. When the piston rod (3) descends to the lowest position, the push rod (52) pushes the piston block (34) to the top of the air flow channel (33).

2. The agricultural bio-amino acid selenium nutrient solution fermentation tank according to claim 1, characterized in that: An annular sliding cavity is provided in the cap (35), and the valve plate assembly (4) includes a retaining ring (41) and a connecting rod (42) installed in the sliding cavity. The connecting rod (42) is fixedly connected to the retaining ring (41), and the connecting rod (42) passes through the top of the cap (35) to form a gripping portion. When the connecting rod (42) is pulled upward, the retaining ring (41) moves to the top of the sliding cavity, cutting off the connection between the air flow channel and its top opening.

3. The agricultural bio-amino acid selenium nutrient solution fermentation tank according to claim 2, characterized in that: A spring (43) is installed between the connecting ring and the cover cap (35) for lowering and resetting the retaining ring (41). The resistance encountered by the piston rod (3) when moving upward relative to the mounting seat (2) is greater than the maximum elastic force of the spring (43).

4. The agricultural bio-amino acid selenium nutrient solution fermentation tank according to claim 1, characterized in that: The diameter of the bottom portion of the piston rod (3) is larger than the diameter of the upper portion thereof, so that a temporary storage cavity (32) for storing bacterial liquid is formed at the bottom portion of the piston rod (3).

5. The agricultural bio-amino acid selenium nutrient solution fermentation tank according to claim 4, characterized in that: The bottom of the mounting seat (2) is fixedly connected to a sleeve (23), the bottom end of the sleeve (23) is open, the piston rod (3) and the sleeve (23) are coaxially arranged, and when the piston rod (3) rises to the maximum height, the bottom of the piston rod (3) and the sleeve (23) are sealed.

6. The agricultural bio-amino acid selenium nutrient solution fermentation tank according to claim 5, characterized in that: The support rod (51) is horizontally slidably mounted on the bottom of the sleeve (23). An elastic member (511) is connected between the support rod (51) and the sleeve (23) for moving the support rod (51) toward the bottom of the piston rod (3). When the piston block (34) slides to the bottom end of the air flow channel (33), the control mechanism (53) retracts the support rod (51).

7. The agricultural bio-amino acid selenium nutrient solution fermentation tank according to claim 6, characterized in that: The control mechanism (53) comprises a push block (531) slidably mounted on the bottom of the piston rod (3) and a connecting rod (532) hinged to the bottom of the piston rod (3); a connecting rod (533) is hinged between the push block (531) and the connecting rod (532); and an end of the connecting rod (532) away from the push block (531) is located below the piston block (34).

8. The agricultural bio-amino acid selenium nutrient solution fermentation tank according to any one of claims 1 to 7, characterized in that: The upper surface of the mounting seat (2) is provided with an annular groove (21) which is concentric with the through hole.

9. The agricultural bio-amino acid selenium nutrient solution fermentation tank according to claim 1, characterized in that: The cover cap (35) is rotatably mounted on the piston rod (3), and the cover cap (35) is threadedly connected to the mounting seat (2).

10. The agricultural bio-amino acid selenium nutrient solution fermentation tank according to claim 9, characterized in that: A sealing ring (22) is provided above the through hole of the mounting seat (2), a thread is provided on the outer circumferential surface of the sealing ring (22), and a threaded sleeve (352) that cooperates with the sealing ring is provided at the bottom of the cap (35).

Images