Dining table residual food feed fermentation process and fermentation tank

Abstract

The invention relates to a dining table residual food feed fermentation tank which comprises a shell, the overturning mechanism comprises a rotating pipe rotationally connected to the top in the shell, a vertical cylinder is arranged in the shell, mounting strips are fixedly connected to the two sides of the vertical cylinder, the other ends of the two mounting strips are fixedly connected with the interior of the shell, the lower end of the rotating pipe penetrates through the vertical cylinder, and the lower end of the rotating pipe penetrates through the vertical cylinder. A spiral blade is mounted on the part, located in the vertical cylinder, of the rotating pipe, and two stirring pipes are symmetrically and fixedly connected to the outer side of the lower end part of the rotating pipe; the driving mechanism is used for driving the rotating pipe to rotate; and a gas extraction mechanism. The invention further discloses a dining table residual food feed fermentation process. According to the fermentation tank, oxygen in the tank body can be reduced, anaerobic fermentation is promoted, in addition, the indication mechanism is arranged, and whether the interior of the fermentation tank is in a sealed state or not can be judged.

Description

Technical Field

[0001] The present invention relates to the field of feed production, and particularly relates to a fermentation process and a fermentation tank for converting table leftovers into feed. Background Art

[0002] For the fermentation of table leftovers into feed, the anaerobic fermentation method can better retain the nutrients in the food, reduce the oxidative loss of nutrients, and at the same time reduce the generation of odors during the fermentation process, making it more suitable for large-scale industrial production. At present, although there are some fermentation tank devices for food fermentation on the market, there are still many deficiencies when applied to the anaerobic fermentation of table leftovers into feed, which are mainly reflected in the following aspects: 1. The key to anaerobic fermentation is to create an oxygen-deficient environment to promote the growth and metabolism of anaerobic microorganisms. After the existing anaerobic fermentation tank is filled with materials, a large amount of air is easily left inside the tank body, and the oxygen in this air will affect the progress of anaerobic fermentation.

[0003] 2. Since the existing fermentation tank cannot intuitively display the sealing state inside the tank body, it is very difficult for the operator to accurately judge whether it is in a truly anaerobic environment during the fermentation process. In actual production, the operator often can only roughly judge the sealing condition of the fermentation tank by experience or through indirect methods, such as observing whether there is a sound of gas leakage or checking whether there is condensed water on the surface of the tank body. However, these methods have great subjectivity and uncertainty, and it is difficult to ensure the stability and reliability of the fermentation process. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages existing in the prior art, and to propose a fermentation process and a fermentation tank for converting table leftovers into feed. During the actual use of this fermentation tank, the oxygen inside the tank body can be reduced to promote the progress of anaerobic fermentation. In addition, an indicating mechanism is provided to judge whether the inside of the fermentation tank is in a sealed state.

[0005] In order to achieve the above purpose, the present invention adopts the following technical solutions: A fermentation tank for converting table waste into feed, comprising a shell; a turning mechanism, the turning mechanism comprising a rotating tube rotatably connected to the top of the shell, a vertical cylinder being provided inside the shell, mounting bars being fixedly connected on both sides of the vertical cylinder, the other ends of the two mounting bars being fixedly connected to the interior of the shell, the lower end of the rotating tube passing through the vertical cylinder, a spiral blade being installed on the part of the rotating tube located inside the vertical cylinder, and two stirring tubes being symmetrically fixedly connected to the outer side of the lower end of the rotating tube; a driving mechanism for driving the rotating tube to rotate; a gas extraction mechanism for reducing the extraction of gas inside the fermentation tank, thereby facilitating anaerobic fermentation; and an indicating mechanism for judging whether the interior of the shell is in a sealed state.

[0006] Preferably, the upper end of the shell is fixedly connected with a feeding port, the lower end of the shell is installed with a discharge port, and the lower end of the shell is fixedly connected with a bracket.

[0007] Preferably, an annular tube is provided inside the shell, and the annular tube is a temperature conducting tube. A heat exchanger is installed on the front side of the shell, and the liquid inlet and liquid outlet of the heat exchanger are both connected to the annular tube.

[0008] Preferably, the driving mechanism includes an L-shaped plate installed on the upper end of the shell, a mounting frame is installed on the upper end of the L-shaped plate, a driving motor is installed on the mounting frame, the upper end of the rotating tube extends to the outside, and pulleys are installed on the output shaft of the driving motor and the outside of the rotating tube, and the two pulleys are connected by a transmission belt.

[0009] Preferably, the gas extraction mechanism includes a piston cylinder fixedly connected to the left side of the vertical portion of the L-shaped plate, a sliding piston plate that can slide left and right is provided in the piston cylinder, the left side of the sliding piston plate is rotatably connected to a drive rod, the output shaft of the drive motor is fixedly connected to a drive disk, and the other end of the drive rod is rotatably connected to the eccentric lower end of the drive disk.

[0010] Preferably, the right side space of the piston cylinder is connected to a first one-way tube and a second one-way tube, and the other end of the second one-way tube is connected to the inner top space of the shell.

[0011] Preferably, a first one-way valve is installed inside the first one-way tube, and a second one-way valve is installed inside the second one-way tube. The one-way flow direction of the first one-way valve is one-way discharge from the piston cylinder to the outside, and the one-way flow direction of the one-way valve inside the second one-way tube is one-way entry from the shell into the piston cylinder.

[0012] Preferably, the indicating mechanism includes a detection cylinder fixedly connected to the upper end of the housing. The inner bottom of the detection cylinder communicates with the interior of the housing. A through opening is provided at the inner top of the detection cylinder. A columnar groove is provided in the detection cylinder. A slidable piston plate is provided in the columnar groove and is elastically connected to the inner top of the columnar groove by a spring at its upper end. The detection cylinder is a transparent cylinder and an indicating groove is provided on the outer side.

[0013] Preferably, a high-pressure nitrogen storage cylinder is installed at the rear side of the housing. The air outlet end of the high-pressure nitrogen storage cylinder is communicated with a release pipe. The other end of the release pipe is communicated with the upper end of a rotating pipe through a rotary joint. A plurality of air holes are provided at the inner top of each stirring pipe. An electromagnetic valve is installed inside the release pipe. A gas pressure sensor is installed at the inner top of the housing. The gas pressure sensor is electrically connected to the electromagnetic valve.

[0014] The present invention also discloses a table food residue feed fermentation process, which uses the above fermentation tank and includes the following steps: The first step: Collect leftovers from places such as schools, factories, and restaurants, and remove hard impurities to avoid damaging equipment or affecting the activity of strains during the fermentation process. The second step: Drain the clear water in the raw materials and adjust the moisture content to 50%-60% to create a suitable environment for subsequent fermentation. The third step: According to needs, the raw materials can be crushed and auxiliary materials can be added to adjust the carbon-nitrogen ratio to promote the growth of strains, and a feed fermentation agent is added and fully mixed evenly. The fourth step: Pour the mixed raw materials into the housing and perform fermentation treatment on them. After the fermentation treatment is completed, perform low-temperature drying on them to reduce the moisture content to less than 12% and store them sealed.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The driving motor drives the driving disk to rotate, causing the sliding piston plate to reciprocate. Through the cooperation of two one-way valves, the air in the housing is efficiently and continuously evacuated, quickly reducing the oxygen content, providing an ideal environment for anaerobic fermentation. The gas pressure sensor monitors the air pressure in real time. When the threshold is reached, the electromagnetic valve is automatically opened to fill nitrogen, evenly discharging the residual oxygen in the material gaps. The rotating components cooperate to turn the materials, enabling nitrogen to completely replace the air, and stabilizing the fermentation environment.

[0016] 2. The heat exchanger circulates the coolant in the annular pipe, accurately absorbs and takes away the heat generated by the metabolism of microorganisms in the housing, keeping the temperature always within a suitable range, ensuring the activity of microorganisms, and promoting the efficient progress of fermentation.

[0017] 3. Regularly start the driving motor to drive the rotating pipe to rotate. The spiral blades cooperate with the stirring pipes to fully turn and stir the materials, enabling the materials to fully contact with nitrogen, promoting the discharge of gas, and ensuring uniform and efficient fermentation.

[0018] 4. The indicating mechanism can visually judge the sealing status of the shell by observing the position of the sliding piston plate in the transparent detection cylinder. If the piston plate is in the indicating groove position for a long time, the sealing leakage problem can be discovered in time for timely treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic structural diagram of a table waste feed fermentation tank proposed by the present invention; Figure 2 for Figure 1 A magnified schematic diagram of point A; Figure 3 for Figure 1 Schematic diagram of the cross-section structure; Figure 4 is a cross-sectional schematic diagram of the indicating mechanism; Figure 5 Schematic cross-section of the gas extraction mechanism.

[0020] In the figure: 1 shell, 2 bracket, 3 heat exchanger, 4 feeding port, 5 detection cylinder, 6 rotating tube, 7 rotary joint, 8 release tube, 9 driving motor, 10 mounting frame, 11 annular tube, 12 vertical cylinder, 13 mounting bar, 14 discharge port, 15 stirring tube, 16 air hole, 17 L-shaped plate, 18 piston cylinder, 19 first one-way tube, 20 second one-way tube, 21 first one-way valve, 22 second one-way valve, 23 gas pressure sensor, 24 high-pressure nitrogen storage cylinder, 25 driving rod, 26 columnar groove, 27 spring, 28 indicating piston plate, 29 indicating groove, 30 through port, 31 pulley, 32 transmission belt, 33 driving disk, 34 sliding piston plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0023] Reference Figures 1 - 5 A table waste food feed fermentation tank includes a shell 1, an upper end of the shell 1 is fixedly connected to a feeding port 4, a lower end of the shell 1 is provided with a discharge port 14, and both the feeding port 4 and the discharge port 14 are provided with sealing covers. During the fermentation process, both sealing covers are sealed. A bracket 2 is fixedly connected to the lower end of the shell 1; As an implementation manner of the present invention, an annular tube 11 is arranged inside the housing 1. The annular tube 11 is made of a heat-conducting tube. A heat exchanger 3 is installed on the front side of the housing 1. The liquid inlet end and the liquid outlet end of the heat exchanger 3 are both communicated with the annular tube 11. The temperature inside the housing 1 can be reduced through the heat exchanger 3. Since the temperature continuously rises during anaerobic fermentation, reducing the temperature and keeping it at an appropriate state can increase the activity of microorganisms and promote the fermentation process. As an implementation manner of the present invention, it further includes a turning mechanism. The turning mechanism includes a rotating tube 6 rotatably connected to the inner top of the housing 1. A vertical cylinder 12 is arranged inside the housing 1. Installation bars 13 are fixedly connected to both sides of the vertical cylinder 12. The other ends of the two installation bars 13 are fixedly connected to the inside of the housing 1. The lower end of the rotating tube 6 penetrates through the vertical cylinder 12. A spiral blade is installed on the part of the rotating tube 6 located inside the vertical cylinder 12. Two stirring tubes 15 are symmetrically and fixedly connected to the outer side of the lower end part of the rotating tube 6. Through the rotation of the spiral blade, the internal materials can be continuously turned. Turning can make the fermentation gas in the materials easier to discharge, and at the same time promote the fermentation process. In addition, after turning, stirring by the stirring tubes 15, and subsequent charging of nitrogen, nitrogen can more easily and more evenly pass through the material gaps, and discharge the residual oxygen or the waste gas generated by fermentation in the material gaps to the outside for treatment. As an implementation manner of the present invention, it further includes a driving mechanism for driving the rotating tube 6 to rotate. The driving mechanism includes an L-shaped plate 17 installed on the upper end of the housing 1. An installation frame 10 is installed on the upper end of the L-shaped plate 17. A driving motor 9 is installed on the installation frame 10. The upper end of the rotating tube 6 extends to the outside. Belt pulleys 31 are installed on the output shaft of the driving motor 9 and the outer side of the rotating tube 6 respectively. The two belt pulleys 31 are connected by a transmission belt 32. As an embodiment of the present invention, it further includes a gas extraction mechanism. The gas extraction mechanism is used to reduce the gas inside the fermentation tank and facilitate anaerobic fermentation. The gas extraction mechanism includes a piston cylinder 18 fixedly connected to the left side of the vertical part of the L-shaped plate 17. A sliding piston plate 34 that can slide left and right is arranged inside the piston cylinder 18. A driving rod 25 is rotatably connected to the left side of the sliding piston plate 34. The output shaft of the driving motor 9 is fixedly connected to a driving disk 33. The other end of the driving rod 25 is rotatably connected to the eccentric position at the lower end of the driving disk 33. The right side space of the piston cylinder 18 communicates with a first one-way pipe 19 and a second one-way pipe 20. The other end of the second one-way pipe 20 communicates with the inner top space of the housing 1. A first one-way valve 21 is installed inside the first one-way pipe 19, and a second one-way valve 22 is installed inside the second one-way pipe 20. The one-way flow direction of the first one-way valve 21 is to discharge to the outside unidirectionally from the piston cylinder 18, and the flow direction of the one-way valve inside the second one-way pipe 20 is to enter the piston cylinder 18 unidirectionally from the housing 1. By using the first one-way valve 21 and the second one-way valve 22, a unidirectional gas flow among the inside of the housing 1, the piston cylinder and the outside can be generated. In the initial state, this gas flow can evacuate the air inside the housing 1. Cooperating with the nitrogen supply, the oxygen content can be rapidly reduced, thereby ensuring the subsequent anaerobic fermentation. During the subsequent fermentation process, the evacuation of air can extract the fermentation waste gas. The other end of the first one-way pipe 19 communicates with an external waste gas treatment system; As an embodiment of the present invention, a high-pressure nitrogen storage cylinder 24 is installed at the rear side of the housing 1. The high-pressure nitrogen storage cylinder 24 is connected to an external nitrogen supply device to ensure that the internal air pressure is always in a relatively high state. The gas outlet end of the high-pressure nitrogen storage cylinder 24 is connected to a release pipe 8. Further, the gas flow rate released by the release pipe 8 is higher than the exhaust speed when the driving motor 9 is working. The other end of the release pipe 8 is connected to the upper end of the rotating pipe 6 through a rotary joint 7. A plurality of air holes 16 are opened at the inner top of each stirring pipe 15. An electromagnetic valve is installed inside the release pipe 8. A gas pressure sensor 23 is installed at the inner top of the housing 1. The gas pressure sensor 23 is electrically connected to the electromagnetic valve. When the gas pressure sensor 23 senses that the internal air pressure of the housing 1 drops to a set threshold value, it will control the electromagnetic valve to open for a period of time to allow nitrogen to enter until the internal pressure returns to a normal state, and then the driving motor 9 and the electromagnetic valve are synchronously closed; As an embodiment of the present invention, it further includes an indicating mechanism. The indicating mechanism is used to judge whether the inside of the housing 1 is in a sealed state. The indicating mechanism includes a detection cylinder 5 fixedly connected to the upper end of the housing 1. The inner bottom of the detection cylinder 5 is communicated with the inside of the housing 1. An opening 30 is provided at the inner top of the detection cylinder 5. A columnar groove 26 is provided in the detection cylinder 5. A slidable piston plate 34 is provided in the columnar groove 26. The upper end of the slidable piston plate 34 is elastically connected to the inner top of the columnar groove 26 through a spring 27. The detection cylinder 5 is a transparent cylinder, and an indicating groove 29 is provided on the outer side. When the slidable piston plate 34 is in the position of the indicating groove 29 for a long time, it means that the air pressure inside the housing 1 is the same as the external air pressure, which means there is a leakage situation and the sealing performance is not good.

[0024] In the present invention, the operator puts the remaining food on the dining table into the inside of the housing 1 from the feeding port 4, and then tightly closes the sealing covers of the feeding port 4 and the discharging port 14 respectively to complete the sealing operation of the fermentation tank, preventing external air from entering and creating basic conditions for subsequent anaerobic fermentation. The driving motor 9 is started, and the driving disk 33 is driven to rotate through the pulley 31 and the transmission belt 32. When the driving disk 33 rotates, the driving rod 25 makes an eccentric movement, and then pulls the slidable piston plate 34 to slide left and right in the piston cylinder 18. When the slidable piston plate 34 slides to the left, a negative pressure is generated in the right space of the piston cylinder 18. Under the action of the second one-way valve 22, the air inside the housing 1 is pumped into the right space of the piston cylinder 18 through the second one-way pipe 20. When the slidable piston plate 34 slides to the right, the air in the right space of the piston cylinder 18 is discharged to the external waste gas treatment system through the first one-way pipe 19 under the action of the first one-way valve 21. In this way, the cycle continues, continuously pumping out the air inside the housing 1 and reducing the oxygen content inside the housing 1. While the gas extraction mechanism is working, the gas pressure sensor 23 monitors the air pressure change inside the housing 1 in real time. When the gas pressure sensor 23 senses that the air pressure inside the housing 1 drops to the set threshold, it sends an electrical signal to the solenoid valve to control the solenoid valve to open for a period of time. At this time, the nitrogen in the high-pressure nitrogen storage cylinder 24 enters the rotating pipe 6 through the release pipe 8 and the rotary joint 7, and then is evenly released into the material gap inside the housing 1 through a plurality of air holes 16 provided at the inner top of the stirring pipe 15, discharging the remaining oxygen in the material gap to the outside. During this process, due to the rotation of the driving motor 9, the rotating pipe 6 and the stirring pipe 15 rotate, and the spiral blades can cooperate to turn the materials, and at the same time, the gas is evenly supplied to the bottom of the materials, so that the remaining oxygen can be more comprehensively replaced. As the nitrogen is continuously filled, the air pressure inside the housing 1 gradually increases. When it reaches the normal state, the gas pressure sensor 23 sends a signal again to control the driving motor 9 and the solenoid valve to close synchronously, completing the air extraction and nitrogen filling operations. During the fermentation process, the metabolic activities of microorganisms generate heat, causing the temperature inside the housing 1 to continuously rise. To ensure the viability of the microorganisms and facilitate the smooth progress of fermentation, the heat exchanger 3 starts to operate. The liquid inlet end of the heat exchanger 3 inputs low-temperature coolant into the annular pipe 11. During the flow of the coolant in the annular pipe 11, it absorbs the heat inside the housing 1, and then flows out from the liquid outlet end of the heat exchanger 3 to complete the heat exchange, thereby reducing the temperature inside the housing 1 and keeping the temperature within the range suitable for microorganism fermentation at all times. During the fermentation process, the drive motor 9 can be periodically started to continuously operate. The rotating pipe 6 is driven to rotate through the pulley 31 and the transmission belt 32. The spiral blades installed on the part of the rotating pipe 6 located inside the vertical cylinder 12 also rotate accordingly. Under the action of the spiral blades, the materials inside the housing 1 are continuously turned upwards, enabling the materials to come into full contact with nitrogen, and the gases generated by fermentation are more easily discharged. At the same time, the two stirring pipes 15 symmetrically and fixedly connected to the outer side of the lower part of the rotating pipe 6 also rotate accordingly to stir the materials, further promoting the uniform mixing of the materials and the discharge of gases, and ensuring the smooth progress of the fermentation process. During the fermentation process, the waste gases generated by the metabolism of microorganisms are continuously produced. Under the continuous operation of the drive motor 9, the gas extraction mechanism continues to operate according to the above working principle, pumping the fermentation waste gases inside the housing 1 into the piston cylinder 18 through the second one-way pipe 20, and then discharging them to the external waste gas treatment system through the first one-way pipe 19, maintaining the stability of the gas environment inside the housing 1, avoiding the adverse impact on fermentation caused by the accumulation of waste gases, and introducing relatively low-temperature nitrogen from the outside during this process, which can reduce the temperature inside the housing 1, thereby reducing the working frequency of the heat exchanger 3 and reducing energy consumption. During the fermentation process, the indicating mechanism starts to work. The operator can judge the position of the sliding piston plate 34 by observing the indicating groove 29 on the outer side of the transparent detection cylinder 5. If the sliding piston plate 34 remains in the corresponding position of the indicating groove 29 for a long time, it indicates that the air pressure inside the housing 1 is the same as the external air pressure, there is a seal leakage situation, and the sealing performance is not good. It is necessary to re-check and seal the possible leakage parts such as the feeding port 4 and the discharging port 14. When the fermentation process reaches the set time or the fermentation index meets the requirements, the fermentation is completed. The operator opens the sealing cover of the discharging port 14 and discharges the fermented feed from the discharging port 14 to complete the entire fermentation process of turning table leftovers into feed. After the discharging is completed, the fermentation tank can be cleaned and disinfected to prepare for the next fermentation.

[0025] The present invention also discloses a fermentation process for turning table leftovers into feed, which adopts the above fermentation tank and includes the following steps: The first step: Collect the leftovers from schools, factories, restaurants and other places, and remove hard impurities to avoid damaging the equipment or affecting the activity of the strains during the fermentation process. The second step: Drain the clear water in the raw materials and adjust the moisture content to 50%-60% to create a suitable environment for subsequent fermentation. Step 3: If needed, the raw materials can be crushed and auxiliary materials can be added to adjust the carbon-nitrogen ratio, promote the growth of bacteria, add feed starter, and mix thoroughly; Step 4: Pour the mixture into the shell 1 and ferment it. After the fermentation is completed, dry it at low temperature to reduce the moisture content to below 12%, and seal it for storage.

[0026] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can, for example, be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0027] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A fermentation tank for converting the remaining food on the dining table into feed, characterized in that, include: Housing (1); A turning mechanism, the turning mechanism comprising a turning tube (6) rotatably connected to the top of the shell (1), a vertical cylinder (12) being provided inside the shell (1), both sides of the vertical cylinder (12) being fixedly connected to mounting bars (13), the other ends of the two mounting bars (13) being fixedly connected to the inside of the shell (1), the lower end of the turning tube (6) passing through the vertical cylinder (12), a spiral blade being installed on the inner portion of the turning tube (6) located in the vertical cylinder (12), and two stirring tubes (15) being symmetrically fixedly connected to the outer side of the lower end portion of the turning tube (6); A driving mechanism, the driving mechanism being used to drive the rotating tube (6) to rotate; A gas extraction mechanism, which is used to reduce the extraction of gas inside the fermentation tank, thereby facilitating anaerobic fermentation; An indicating mechanism is used to determine whether the interior of the housing (1) is in a sealed state.

2. The table waste feed fermentation tank according to claim 1, characterized in that: The upper end of the shell (1) is fixedly connected to a feeding port (4), the lower end of the shell (1) is provided with a discharge port (14), and the lower end of the shell (1) is fixedly connected to a bracket (2).

3. A fermentation tank for feed conversion of leftover food on a dining table according to claim 1, characterized in that, An annular tube (11) is provided inside the shell (1), and the annular tube (11) is a temperature conducting tube. A heat exchanger (3) is installed on the front side of the shell (1), and the liquid inlet and liquid outlet of the heat exchanger (3) are both in communication with the annular tube (11).

4. A fermentation tank for feed conversion of table leftovers according to claim 1, characterized in that, The driving mechanism comprises an L-shaped plate (17) mounted on the upper end of the housing (1), a mounting frame (10) being mounted on the upper end of the L-shaped plate (17), a driving motor (9) being mounted on the mounting frame (10), the upper end of the rotating tube (6) extending to the outside, a pulley (31) being mounted on the output shaft of the driving motor (9) and the outer side of the rotating tube (6), and the two pulleys (31) being connected by a transmission belt (32).

5. A fermentation tank for feed conversion of table leftovers according to claim 4, characterized in that, The gas extraction mechanism comprises a piston cylinder (18) fixedly connected to the left side of the vertical portion of the L-shaped plate (17), a sliding piston plate (34) capable of sliding left and right is provided in the piston cylinder (18), the left side of the sliding piston plate (34) is rotatably connected to a driving rod (25), the output shaft of the driving motor (9) is fixedly connected to a driving disk (33), and the other end of the driving rod (25) is rotatably connected to an eccentric portion of the lower end of the driving disk (33).

6. The table waste feed fermentation tank according to claim 1, characterized in that: The right side space of the piston cylinder (18) is connected to a first one-way tube (19) and a second one-way tube (20), and the other end of the second one-way tube (20) is connected to the inner top space of the housing (1).

7. A fermentation tank for feed conversion of table leftovers according to claim 6, characterized in that, A first one-way valve (21) is installed inside the first one-way tube (19), and a second one-way valve (22) is installed inside the second one-way tube (20). The one-way flow direction of the first one-way valve (21) is one-way discharge from the piston cylinder (18) to the outside, and the one-way flow direction of the second one-way valve inside the one-way tube (20) is one-way flow from the housing (1) to the piston cylinder (18).

8. A fermentation tank for feed conversion of table leftovers according to claim 1, characterized in that, The indicating mechanism includes a detection cylinder (5) fixedly connected to the upper end of the housing (1). The inner bottom of the detection cylinder (5) is communicated with the inside of the housing (1). A through opening (30) is formed in the inner top of the detection cylinder (5). A columnar groove (26) is arranged in the detection cylinder (5). A sliding piston plate (34) which can slide up and down is arranged in the columnar groove (26). The upper end of the sliding piston plate (34) is elastically connected with the inner top of the columnar groove (26) through a spring (27). The detection cylinder (5) is a transparent cylinder and an indicating groove (29) is arranged on the outer side.

9. The fermenter for feed conversion of table leftovers according to claim 8, characterized in that, A high-pressure nitrogen storage cylinder (24) is installed at the rear side of the housing (1). The air outlet end of the high-pressure nitrogen storage cylinder (24) is communicated with a release pipe (8). The other end of the release pipe (8) is communicated with the upper end of a rotating pipe (6) through a rotary joint (7). A plurality of air holes (16) are formed in the inner top of each stirring pipe (15). An electromagnetic valve is installed inside the release pipe (8). A gas pressure sensor (23) is installed on the inner top of the housing (1). The gas pressure sensor (23) is electrically connected with the electromagnetic valve.

10. A fermentation process for converting leftover food on the dining table into feed, using a fermentation tank as described in any one of claims 1-9, characterized in that, It includes the following steps: The first step: Collect the leftovers from places such as schools, factories, and restaurants, and remove hard impurities to avoid damaging the equipment or affecting the activity of the strains during the fermentation process; The second step: Drain the clear water in the raw materials and adjust the moisture content to 50%-60% to create a suitable environment for subsequent fermentation; The third step: According to needs, the raw materials can be crushed and auxiliary materials can be added to adjust the carbon-nitrogen ratio to promote the growth of the strains, and a feed fermentation agent is added and fully mixed evenly; The fourth step: Pour the mixed raw materials into the housing (1), carry out fermentation treatment on it. After the fermentation treatment is completed, carry out low-temperature drying on it to reduce the moisture content to less than 12%, and store it in a sealed manner.

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