Biogas digester capable of fully fermenting animal waste to reduce loss and method thereof

Abstract

The invention relates to the technical field of biogas digesters, and discloses a biogas digester capable of fully fermenting animal waste to reduce loss and a method thereof.The biogas digester comprises a fermentation bin, the top of the fermentation bin is fixedly communicated with a biogas valve, the bottom of the fermentation bin is fixedly connected with an inclined bottom plate, and a stirring mechanism is arranged in the fermentation bin; the front part of the fermentation bin is fixedly communicated with a precipitation mechanism, the rear part of the fermentation bin is fixedly communicated with a feeding mechanism, the stirring mechanism comprises a motor I, a connecting shaft, a stirring paddle, a universal joint, a transmission shaft and a push plate, and the connecting shaft is rotationally connected to the inner wall of the fermentation bin. The materials can be ensured to be in uniform contact with microorganisms, the fermentation materials at the bottom of the fermentation bin can be pushed to prevent the materials from settling sand at the bottom of the fermentation bin to influence the fermentation efficiency, and meanwhile, the settled fermentation materials are collected in the primary sedimentation tank.

Description

Technical Field

[0001] This invention relates to the field of biogas digester technology, specifically to a biogas digester and method for fully fermenting animal manure and reducing its loss. Background Technology

[0002] A biogas digester is a closed container used for anaerobic fermentation (anaerobic decomposition) of organic waste. Through the action of microorganisms, organic matter (such as animal manure, crop straw, kitchen waste, etc.) is converted into biogas. The main components of biogas are methane and carbon dioxide, as well as organic fertilizers such as biogas residue and biogas slurry.

[0003] Patent CN202107701U discloses a biogas digester that solves the shortcomings of traditional biogas digesters, such as cumbersome construction process, long construction period, lack of quality assurance, poor insulation and airtightness of cement materials, unfavorable high-temperature fermentation, and easy gas and water leakage, leading to the digester's obsolescence. The digester described in this patent has a detachable structure for its cover, body, and bottom. The body is formed by at least one detachable plate, and the bottom is formed by splicing at least one detachable plate. The cover includes a main cover and a secondary cover that cooperate with each other. An inner liner that fits tightly against the inner wall of the digester is also provided within the digester cavity. This biogas digester has the advantages of good insulation, high airtightness, high gas production rate, good safety performance, and simple assembly, and can meet the needs of various users. However, the above-mentioned device is difficult to agitate the fermentation material, which may lead to the formation of scum crust on the top of the fermentation material and the accumulation of sand at the bottom, affecting the fermentation efficiency. Therefore, a biogas digester and method for fully fermenting animal manure and reducing loss are proposed to solve the above-mentioned problems. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a biogas digester and method for fully fermenting animal manure and reducing its loss, in order to address the shortcomings of the prior art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a biogas digester that can fully ferment animal manure and reduce loss, comprising a fermentation chamber, a biogas valve fixedly connected to the top of the fermentation chamber, an inclined bottom plate fixedly connected to the bottom of the fermentation chamber, a stirring mechanism installed inside the fermentation chamber, a sedimentation mechanism fixedly connected to the front of the fermentation chamber, and a feeding mechanism fixedly connected to the rear of the fermentation chamber. The stirring mechanism includes: a motor, a connecting shaft, a stirring paddle, a universal joint, a drive shaft, and a push plate. The connecting shaft is rotatably connected to the inner wall of the fermentation chamber, the stirring paddle is fixedly connected to the circumferential surface of the connecting shaft, and the drive shaft is connected to the connecting shaft away from the inside of the fermentation chamber via the universal joint. One end of the wall is fixedly connected, the push plate is fixedly connected to the circumferential surface of the drive shaft, one output end of the motor is fixedly connected to the end of the connecting shaft away from the universal joint, the drive shaft is rotatably connected to the top of the inclined bottom plate, the push plate contacts the inclined bottom plate, and the fermentation material is stirred by the rotation of the stirring paddle to prevent the scum on the top layer of the fermentation material from forming a crust, which can ensure that the material is evenly contacted with microorganisms. During the rotation of the connecting shaft, the universal joint drives the drive shaft to rotate at the same time. The rotation of the drive shaft drives the push plate to rotate. The rotation of the push plate pushes the fermentation material at the bottom of the fermentation chamber to prevent the material from settling at the bottom of the fermentation chamber and affecting the fermentation efficiency. At the same time, the settled fermentation material is collected in the primary sedimentation tank.

[0006] Preferably, the sedimentation mechanism includes: a primary sedimentation tank, a secondary sedimentation tank, a tertiary sedimentation tank, a storage tank, connecting pipes, a manhole cover, and an inspection door. The primary sedimentation tank is fixedly connected to the front of the fermentation chamber, the tertiary sedimentation tank is fixedly connected to the front of the primary sedimentation tank, the secondary sedimentation tank is fixedly connected to the bottom of the tertiary sedimentation tank, the primary sedimentation tank is fixedly connected to the secondary sedimentation tank via connecting pipes, the storage tank is fixedly connected to the front of the tertiary sedimentation tank, the manhole cover is installed on the top of the tertiary sedimentation tank, and the inspection door is installed on the inner wall of the primary sedimentation tank. The sedimentation mechanism also includes: a stop block, a rack, a gear, and a rotating plate. The stop block is slidably connected to the inner wall of the channel connecting the fermentation chamber and the primary sedimentation tank, the rack is fixedly connected to the front of the stop block, the gear is rotatably connected to the inner wall of the channel connecting the fermentation chamber and the primary sedimentation tank, and the rotating plate is fixedly connected to the gear shaft. The secondary sedimentation tank has outlets on both sides, and the tertiary sedimentation tank... The front of the tank has an outlet, and the outlet at the front of the tertiary sedimentation tank is connected to the storage tank. The height of the outlet at the front of the tertiary sedimentation tank is lower than the height of the outlets on both sides of the secondary sedimentation tank. The gear and rack mesh to effectively prevent material accumulation and blockage of the channel. The push plate squeezes the baffle to drive the rotating plate to rotate, which can also extend the retention time of the material and ensure that the material has enough time to be degraded, thereby improving the gas production rate. As the biogas in the fermentation chamber increases and the pressure gradually increases, the biogas slurry is gradually discharged into the primary sedimentation tank for preliminary sedimentation. When the biogas slurry reaches the connecting pipe of the primary sedimentation tank, it flows into the secondary sedimentation tank for secondary sedimentation through the connecting pipe. When the secondary sedimentation tank is full of biogas slurry, it overflows through the outlets on both sides of the secondary sedimentation tank into the tertiary sedimentation tank for final tertiary sedimentation. After being filtered by the tertiary sedimentation, the impurities in the biogas slurry are greatly reduced. Then, it is precisely applied to the farmland through a pressurized drip irrigation system to achieve a nitrogen, phosphorus and potassium nutrient utilization rate of ≥85%, which reduces the loss by 40% compared with traditional flood irrigation.

[0007] Preferably, the feeding mechanism includes: a mixing hopper, a feeding trough, and a conveying pipe. The conveying pipe is fixedly connected to the rear of the fermentation chamber. The mixing hopper is installed on the top of the conveying pipe via a flange. The feeding trough is fixedly connected to the rear of the mixing hopper. The feeding mechanism also includes: a motor bracket, a second motor, a stirring slurry, and a water pipe. The motor bracket is fixedly connected to the top of the mixing hopper. The second motor is fixedly connected to the inner wall of the motor bracket. The stirring slurry is fixedly connected to the output end of the second motor. The water pipe is fixedly connected to the top of the mixing hopper and is connected to an external water source. The inner wall of the fermentation chamber is provided with a multi-layer composite impermeable membrane to prevent biogas slurry leakage. The motor is fixedly connected to the top of the primary sedimentation tank. The end of the push plate away from the stop block is equipped with an elastic element for the push plate to reset. In conjunction with the stirring slurry, the animal manure is effectively diluted. The concentration of the animal manure is adjusted by the water flow and the speed of the motor. The concentration adjustment can effectively prevent the effective volume of the fermentation chamber from being quickly occupied by solids, thereby affecting the fermentation process. It can also reduce the stirring difficulty of the stirring paddle and extend the service life of the stirring paddle. When the biogas digester needs maintenance after long-term operation, the slurry pump can be put in to clean the biogas residue by opening the inspection manhole cover. After solid-liquid separation, the fermented biogas residue can be directly returned to the field to replenish the soil organic matter.

[0008] A fermentation method for a biogas digester that can fully ferment animal manure and reduce loss includes the following steps: Step 1: After being processed by the mixing mechanism, the animal manure enters the fermentation chamber for fermentation. During the fermentation process, the motor will start and drive the connecting shaft to rotate, which in turn drives the mixing paddle to rotate. Step 2: During the rotation of the connecting shaft, the drive shaft is simultaneously driven to rotate via the universal joint; Step 3: The rotation of the drive shaft drives the pusher plate to rotate, and the rotation of the pusher plate pushes the fermentation material at the bottom of the fermentation chamber; Step 4: The propelled fermentation material enters the primary sedimentation tank for collection.

[0009] The present invention, by adopting the above technical solution, can bring the following beneficial effects: 1. This biogas digester and its method for fully fermenting animal manure and reducing losses utilize the interaction between the motor, connecting shaft, stirring paddle, universal joint, drive shaft, and push plate to agitate the fermentation material, prevent the scum on the top of the fermentation material from forming a crust, ensure uniform contact of the material with microorganisms, and prevent the material from settling at the bottom of the fermentation chamber, which would affect the fermentation efficiency. At the same time, the settled fermentation material is collected in the primary sedimentation tank.

[0010] 2. This biogas digester and its method, which can fully ferment animal manure and reduce losses, effectively prevents material accumulation and blockage of the channel through the cooperation between the primary sedimentation tank, secondary sedimentation tank, tertiary sedimentation tank, storage tank, connecting pipe, baffle, rack, gear, rotating plate, maintenance manhole cover, and maintenance door. The push plate squeezes the baffle to drive the rotating plate to turn, which can also extend the retention time of the material and ensure that the material has enough time to be degraded, thereby improving the gas production rate. After sedimentation and filtration in the primary, secondary, and tertiary sedimentation tanks, the impurities in the biogas slurry are greatly reduced. Then, it is precisely applied to farmland through a pressurized drip irrigation system to achieve a nitrogen, phosphorus, and potassium nutrient utilization rate of ≥85%, which reduces losses by 40% compared to traditional flood irrigation.

[0011] 3. The biogas digester and its method for fully fermenting animal manure and reducing loss, through the cooperation between the mixing bucket, feeding trough, conveying pipe, motor support, motor II, stirring slurry, and water pipe, can adjust the concentration of animal manure, effectively prevent the effective volume of the fermentation chamber from being quickly occupied by solids, thereby affecting the fermentation process, and also reduce the stirring difficulty of the mixing paddle and extend the service life of the mixing paddle. Attached Figure Description

[0012] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional view of the fermentation chamber structure of the present invention; Figure 3 This is a cross-sectional view of the stirring mechanism of the present invention; Figure 4 This is a cross-sectional view of the sedimentation mechanism of the present invention; Figure 5 For the present invention Figure 4 Enlarged view of the A-structure; Figure 6 This is an enlarged view of the feeding mechanism of the present invention; Figure 7 This is a cross-sectional view of the stirring bucket structure of the present invention.

[0013] In the diagram: 1. Fermentation chamber; 2. Biogas valve; 3. Inclined bottom plate; 4. Mixing mechanism; 401. Motor 1; 402. Connecting shaft; 403. Mixing paddle; 404. Universal joint; 405. Drive shaft; 406. Push plate; 5. Sedimentation mechanism; 501. Primary sedimentation tank; 502. Secondary sedimentation tank; 503. Tertiary sedimentation tank; 504. Storage tank; 505. Connecting pipe; 506. Stop block; 507. Rack; 508. Gear; 509. Rotating plate; 510. Manhole cover; 511. Inspection door; 6. Feeding mechanism; 601. Mixing hopper; 602. Feed trough; 603. Conveying pipe; 604. Motor bracket; 605. Motor 2; 606. Turning slurry; 607. Water pipe. Detailed Implementation

[0014] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0015] Please see Figures 1-7 One embodiment of the present invention is as follows: a biogas digester that can fully ferment animal manure and reduce loss, comprising a fermentation chamber 1, a biogas valve 2 fixedly connected to the top of the fermentation chamber 1, a sloping bottom plate 3 fixedly connected to the bottom of the fermentation chamber 1, a stirring mechanism 4 disposed inside the fermentation chamber 1, a sedimentation mechanism 5 fixedly connected to the front of the fermentation chamber 1, and a feeding mechanism 6 fixedly connected to the rear of the fermentation chamber 1. The stirring mechanism 4 includes: a motor 401, a connecting shaft 402, a stirring paddle 403, a universal joint 404, a drive shaft 405, and a pusher plate 406. Animal manure enters the fermentation chamber 1 for fermentation after being processed by the stirring mechanism 4. During the fermentation process, the motor 401 will start and drive the connecting shaft 402 to rotate. 02 rotates, driving the stirring paddle 403 to rotate. The stirring paddle 403 agitates the fermentation material, preventing the scum on the top of the fermentation material from forming a crust. This ensures that the material is evenly contacted with the microorganisms, allowing it to ferment fully. The connecting shaft 402 is rotatably connected to the inner wall of the fermentation chamber 1. The stirring paddle 403 is fixedly connected to the circumferential surface of the connecting shaft 402. The drive shaft 405 is fixedly connected to the end of the connecting shaft 402 away from the inner wall of the fermentation chamber 1 via a universal joint 404. The push plate 406 is fixedly connected to the circumferential surface of the drive shaft 405. The output end of the motor 401 is fixedly connected to the end of the connecting shaft 402 away from the universal joint 404. The drive shaft 405 is rotatably connected to the top of the inclined bottom plate 3. The push plate 406 is in contact with the inclined bottom plate 3. Working Principle: Animal manure, after being processed by the stirring mechanism 4, enters the fermentation chamber 1 for fermentation. During fermentation, the motor 401 starts, driving the connecting shaft 402 to rotate. The rotation of the connecting shaft 402 drives the stirring paddle 403 to rotate, which in turn stirs the fermentation material, preventing the scum on the top layer from forming a crust. This ensures that the material is evenly contacted with microorganisms, allowing for thorough fermentation. Simultaneously, the rotation of the connecting shaft 402, through the universal joint 404, drives the transmission shaft 405 to rotate. The rotation of the transmission shaft 405 drives the push plate 406 to rotate, which in turn pushes the fermentation material at the bottom of the fermentation chamber 1, preventing sedimentation and ensuring fermentation efficiency. The settled fermentation material is also collected in the primary sedimentation tank 501. The upgraded impermeable membrane structure improves fermentation efficiency, achieving a COD removal rate >90%. Drip irrigation technology solves the runoff pollution and ammonia volatilization problems caused by traditional biogas slurry application. This forms a closed-loop resource system of "manure-biogas-biogas fertilizer-farmland," meeting the needs of ecological agriculture.

[0016] Please see Figures 1-7 Based on the above embodiments, in another embodiment of the present invention, the sedimentation mechanism 5 includes: a primary sedimentation tank 501, a secondary sedimentation tank 502, a tertiary sedimentation tank 503, a storage tank 504, a connecting pipe 505, a maintenance manhole cover 510, and a maintenance door 511. The primary sedimentation tank 501 is fixedly connected to the front of the fermentation chamber 1, the tertiary sedimentation tank 503 is fixedly connected to the front of the primary sedimentation tank 501, the secondary sedimentation tank 502 is fixedly connected to the bottom of the tertiary sedimentation tank 503, the primary sedimentation tank 501 is fixedly connected to the secondary sedimentation tank 502 through the connecting pipe 505, the storage tank 504 is fixedly connected to the front of the tertiary sedimentation tank 503, and the maintenance manhole cover 510 is installed on... The top of the tertiary sedimentation tank 503 has an inspection door 511 installed on the inner wall of the primary sedimentation tank 501. The sedimentation mechanism 5 also includes a stop block 506, a rack 507, a gear 508, and a rotating plate 509. During the process of the push plate 406 pushing the biogas residue, the biogas residue will enter the channel that is fixedly connected between the fermentation chamber 1 and the primary sedimentation tank 501, and be blocked by the rotating plate 509. During the rotation of the push plate 406, it will contact the stop block 506 and push the stop block 506 to move. The movement of the stop block 506 drives the rack 507 to move. The movement of the rack 507 drives the gear 508 to rotate. The rotation of the gear 508 drives the rotating plate 509 to flip, and the flipping of the rotating plate 509 discharges the accumulated fermentation material. To effectively prevent material accumulation and channel blockage, a baffle 506 is slidably connected to the inner wall of the channel connecting fermentation chamber 1 and primary sedimentation tank 501. A rack 507 is fixedly connected to the front of baffle 506, and a gear 508 is rotatably connected to the inner wall of the channel connecting fermentation chamber 1 and primary sedimentation tank 501. A rotating plate 509 is fixedly connected to the shaft of gear 508. Secondary sedimentation tank 502 has outlets on both sides, and tertiary sedimentation tank 503 has an outlet at the front. The outlet at the front of tertiary sedimentation tank 503 is connected to the storage tank 504. The height of the outlet at the front of tertiary sedimentation tank 503 is lower than the height of the outlets on both sides of secondary sedimentation tank 502. Gear 507 is fixedly connected to the front of baffle 506, and gear 508 is rotatably connected to the inner wall of the channel connecting fermentation chamber 1 and primary sedimentation tank 501. 8 meshes with the rack 507, and the push plate 406 squeezes the stop block 506 to drive the rotating plate 509 to flip, which can also extend the retention time of the material and ensure that the material has enough time to be degraded, thereby increasing the gas production rate. As the biogas in the fermentation chamber 1 increases and the pressure gradually increases, the biogas slurry is gradually discharged into the first-stage sedimentation tank 501 for preliminary sedimentation. When the biogas slurry reaches the connecting pipe 505 of the first-stage sedimentation tank 501, it flows into the second-stage sedimentation tank 502 through the connecting pipe 505 for secondary sedimentation. When the second-stage sedimentation tank 502 is full of biogas slurry, it overflows through the liquid outlets on both sides of the second-stage sedimentation tank 502 into the third-stage sedimentation tank 503 for final third-stage sedimentation. After being filtered by the third-stage sedimentation, the impurities in the biogas slurry are greatly reduced.

[0017] The feeding mechanism 6 includes: a mixing hopper 601, a feeding trough 602, and a conveying pipe 603. The conveying pipe 603 is fixedly connected to the rear of the fermentation chamber 1. The mixing hopper 601 is installed on top of the conveying pipe 603 via a flange. The feeding trough 602 is fixedly connected to the rear of the mixing hopper 601. The feeding mechanism 6 also includes: a motor bracket 604, a second motor 605, a mixing slurry 606, and a water pipe 607. Before entering the fermentation chamber 1, the animal manure enters the feeding trough 602 and slides into the mixing hopper 601. The second motor 605 starts and drives the mixing slurry 606 to rotate and mix the animal manure. At this time, the water pipe 607 is opened and water is sprayed into the mixing hopper 601 to effectively dilute the animal manure in conjunction with the mixing slurry 606. The water flow rate is adjusted according to the rotation speed of the second motor 605. The concentration of animal manure is adjusted to prevent the effective volume of fermentation chamber 1 from being rapidly occupied by solids, thus affecting the fermentation process. It also reduces the stirring difficulty of stirring paddle 403 and extends its service life. Motor bracket 604 is fixedly connected to the top of stirring bucket 601. Motor 2 605 is fixedly connected to the inner wall of motor bracket 604. Stirring slurry 606 is fixedly connected to the output end of motor 2 605. Water pipe 607 is fixedly connected to the top of stirring bucket 601 and is connected to an external water source. The inner wall of fermentation chamber 1 is provided with a multi-layer composite impermeable membrane to prevent biogas slurry leakage. Motor 1 401 is fixedly connected to the top of primary sedimentation tank 501. The end of push plate 406 away from the stop block 506 is provided with an elastic element for push plate 406 to reset.

[0018] Working principle: During the process of the pusher plate 406 pushing the biogas residue, the biogas residue enters the channel that is fixedly connected between fermentation chamber 1 and primary sedimentation tank 501, and is blocked by the rotating plate 509. During the rotation of the pusher plate 406, it will contact the stop block 506 and push the stop block 506 to move. The movement of the stop block 506 drives the rack 507 to move, and the movement of the rack 507 drives the gear 508 that meshes with it to rotate. The rotation of the gear 508 drives the rotating plate 509 to flip, and the flipping of the rotating plate 509 discharges the accumulated fermentation material, effectively preventing the material from accumulating and blocking the channel. The pusher plate 406 squeezing the stop block 506 and driving the rotating plate 509 to flip can also extend the retention time of the material and ensure that the material has enough time to dissipate. The biogas is degraded, increasing the biogas production rate. As the biogas in fermentation chamber 1 increases and the pressure gradually rises, the biogas slurry is gradually discharged into the primary sedimentation tank 501 for initial sedimentation. When the biogas slurry reaches the connecting pipe 505 of the primary sedimentation tank 501, it flows into the secondary sedimentation tank 502 for secondary sedimentation. When the secondary sedimentation tank 502 is full of biogas slurry, it overflows through the outlets on both sides of the secondary sedimentation tank 502 into the tertiary sedimentation tank 503 for final tertiary sedimentation. After being filtered through tertiary sedimentation, the impurities in the biogas slurry are greatly reduced. Then, it is precisely applied to farmland through a pressurized drip irrigation system, achieving a nitrogen, phosphorus, and potassium nutrient utilization rate of ≥85%, reducing losses by 40% compared to traditional flood irrigation.

[0019] Before entering the fermentation chamber 1, the animal manure enters the feed trough 602 and slides into the mixing hopper 601. The second motor 605 starts and drives the turning paddle 606 to rotate and turn the animal manure. At this time, the water pipe 607 is opened and water is sprayed into the mixing hopper 601 to effectively dilute the animal manure in conjunction with the turning paddle 606. The concentration of the animal manure is adjusted by the water flow and the speed of the second motor 605. The concentration adjustment can effectively prevent the effective volume of the fermentation chamber 1 from being quickly occupied by solids, thereby affecting the fermentation process. It can also reduce the stirring difficulty of the mixing paddle 403 and extend the service life of the mixing paddle 403. When the biogas digester needs maintenance after long-term operation, the slurry pump can be put in to clean the biogas residue by opening the inspection manhole cover 510. After solid-liquid separation, the fermented biogas residue can be directly returned to the field to replenish the soil organic matter.

[0020] A fermentation method for a biogas digester that can fully ferment animal manure and reduce loss includes the following steps: Step 1: Animal manure is processed by the stirring mechanism 4 and then enters the fermentation chamber 1 for fermentation. During the fermentation process, the motor 401 will start and drive the connecting shaft 402 to rotate. The rotation of the connecting shaft 402 drives the stirring paddle 403 to rotate. Step 2: During the rotation of connecting shaft 402, the universal joint 404 simultaneously drives the drive shaft 405 to rotate; Step 3: The rotation of the drive shaft 405 drives the pusher plate 406 to rotate, and the rotation of the pusher plate 406 pushes the fermentation material at the bottom of the fermentation chamber 1. Step 4: The fermented material is pushed into the primary sedimentation tank 501 for collection.

[0021] This invention provides a biogas digester and method for fully fermenting animal manure and reducing its loss. Many methods and approaches exist for implementing this technical solution; the above description is merely a preferred embodiment of the invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this invention, and these improvements and modifications should also be considered within the scope of protection of this invention. All components not explicitly stated in this embodiment can be implemented using existing technologies.

Claims

1. A biogas digester capable of fully fermenting animal manure and reducing its loss, comprising a fermentation chamber (1), characterized in that: The fermentation chamber (1) is fixedly connected to a biogas valve (2) at the top, and a sloping bottom plate (3) is fixedly connected to the bottom of the fermentation chamber (1). A stirring mechanism (4) is installed inside the fermentation chamber (1). A sedimentation mechanism (5) is fixedly connected to the front of the fermentation chamber (1). A feeding mechanism (6) is fixedly connected to the rear of the fermentation chamber (1). The stirring mechanism (4) includes: a motor (401), a connecting shaft (402), a stirring paddle (403), a universal joint (404), a transmission shaft (405), and a push plate (406). The connecting shaft (402) is rotatably connected to the inner wall of the fermentation chamber (1). The stirring paddle (403) is fixedly connected to the circumferential surface of the connecting shaft (402). The transmission shaft (405) is fixedly connected to the end of the connecting shaft (402) away from the inner wall of the fermentation chamber (1) through the universal joint (404). The push plate (406) is fixedly connected to the circumferential surface of the transmission shaft (405). The output end of the motor (401) is fixedly connected to the end of the connecting shaft (402) away from the universal joint (404).

2. The biogas digester according to claim 1, which can fully ferment animal manure and reduce loss, is characterized in that: The drive shaft (405) is rotatably connected to the top of the inclined base plate (3), and the push plate (406) is in contact with the inclined base plate (3).

3. A biogas digester according to claim 2, characterized in that: The sedimentation mechanism (5) includes: a primary sedimentation tank (501), a secondary sedimentation tank (502), a tertiary sedimentation tank (503), a storage tank (504), a connecting pipe (505), a maintenance manhole cover (510), and a maintenance door (511). The primary sedimentation tank (501) is fixedly connected to the front of the fermentation chamber (1). The tertiary sedimentation tank (503) is fixedly connected to the front of the primary sedimentation tank (501). The secondary sedimentation tank (502) is fixedly connected to the bottom of the tertiary sedimentation tank (503). The primary sedimentation tank (501) is fixedly connected to the secondary sedimentation tank (502) through the connecting pipe (505). The storage tank (504) is fixedly connected to the front of the tertiary sedimentation tank (503). The maintenance manhole cover (510) is installed on the top of the tertiary sedimentation tank (503). The maintenance door (511) is installed on the inner wall of the primary sedimentation tank (501).

4. A biogas digester according to claim 3, which can fully ferment animal manure and reduce loss, is characterized in that: The sedimentation mechanism (5) further includes: a stop block (506), a rack (507), a gear (508), and a rotating plate (509). The stop block (506) is slidably connected to the inner wall of the channel that is fixedly connected between the fermentation chamber (1) and the primary sedimentation tank (501). The rack (507) is fixedly connected to the front of the stop block (506). The gear (508) is rotatably connected to the inner wall of the channel that is fixedly connected between the fermentation chamber (1) and the primary sedimentation tank (501). The rotating plate (509) is fixedly connected to the shaft of the gear (508).

5. A biogas digester according to claim 4, characterized in that: The secondary sedimentation tank (502) has liquid outlets on both sides, and the tertiary sedimentation tank (503) has a liquid outlet at the front. The liquid outlet at the front of the tertiary sedimentation tank (503) is connected to the liquid storage tank (504). The height of the liquid outlet at the front of the tertiary sedimentation tank (503) is lower than the height of the liquid outlets on both sides of the secondary sedimentation tank (502). The gear (508) meshes with the rack (507).

6. A biogas digester according to claim 5, characterized in that: The feeding mechanism (6) includes: a stirring bucket (601), a feeding trough (602), and a conveying pipe (603). The conveying pipe (603) is fixedly connected to the rear of the fermentation chamber (1). The stirring bucket (601) is installed on the top of the conveying pipe (603) through a flange. The feeding trough (602) is fixedly connected to the rear of the stirring bucket (601).

7. A biogas digester according to claim 6, characterized in that: The feeding mechanism (6) also includes: a motor bracket (604), a second motor (605), a stirring slurry (606), and a water pipe (607). The motor bracket (604) is fixedly connected to the top of the mixing hopper (601), the second motor (605) is fixedly connected to the inner wall of the motor bracket (604), the stirring slurry (606) is fixedly connected to the output end of the second motor (605), and the water pipe (607) is fixedly connected to the top of the mixing hopper (601) and is connected to an external water source.

8. A biogas digester according to claim 7, characterized in that: The fermentation chamber (1) is provided with a multi-layer composite impermeable membrane to prevent biogas slurry leakage. The motor (401) is fixedly connected to the top of the primary sedimentation tank (501). The end of the push plate (406) away from the stop block (506) is provided with an elastic element for the push plate (406) to reset.

9. A fermentation method for a biogas digester that can fully ferment animal manure and reduce loss, comprising using the biogas digester described in claim 8, characterized in that: Includes the following steps: Step 1: Animal manure is processed by the stirring mechanism (4) and then enters the fermentation chamber (1) for fermentation. During the fermentation process, the motor (401) will start and drive the connecting shaft (402) to rotate. The rotation of the connecting shaft (402) drives the stirring paddle (403) to rotate. Step 2: During the rotation of the connecting shaft (402), the drive shaft (405) is simultaneously driven to rotate through the universal joint (404); Step 3: The drive shaft (405) rotates, driving the push plate (406) to rotate. The rotation of the push plate (406) pushes the fermentation material at the bottom of the fermentation chamber (1). Step 4: The propelled fermentation material enters the primary sedimentation tank (501) for collection.

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