A multi-stage stirring system for anaerobic fermentation

Abstract

This invention discloses a multi-stage stirring system for anaerobic fermentation, comprising a first mounting frame and a second mounting frame. A grinding box is mounted on the upper end of the first mounting frame. The grinding box contains a partition that divides the interior into a swaying chamber and a grinding chamber from left to right. A swaying mechanism is installed in the swaying chamber, and a grinding mechanism is installed in the grinding chamber. A filter screen is mounted on the swaying mechanism, and the filter screen and grinding mechanism are correspondingly arranged. A first stirring box is mounted on the second mounting frame. The first stirring box contains two stirring chambers, each with a position adjustment structure. The position adjustment mechanism is mounted on the first stirring mechanism. This invention not only enables rapid pretreatment of fermentation materials but also ensures the quality of pretreatment. Furthermore, it can increase the fermentation speed, reduce fermentation costs, and further improve fermentation quality.

Description

Technical Field

[0001] This invention relates to the field of anaerobic fermentation technology, and more particularly to a multi-stage stirring system for anaerobic fermentation. Background Technology

[0002] Anaerobic fermentation refers to the process by which organic matter (such as human and livestock manure, straw, weeds, etc.) is decomposed and metabolized by various microorganisms under certain moisture, temperature, and anaerobic conditions, ultimately forming a combustible mixture of gases such as methane and carbon dioxide. Biogas fermentation systems are based on the principles of biogas fermentation, aiming at energy production and ultimately achieving the comprehensive utilization of biogas, biogas slurry, and biogas residue.

[0003] Anaerobic fermentation is divided into liquefaction, acid production, and methanogenesis stages. Currently, organic matter needs to be pretreated before the liquefaction stage. Existing methods involve simply stirring and crushing the organic matter before putting it into the fermentation tank for fermentation. However, this method requires a long fermentation time and increases the cost of fermentation, which is not conducive to rapid fermentation. Therefore, we propose a multi-stage stirring system for anaerobic fermentation to solve the above problems. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a multi-stage stirring system for anaerobic fermentation.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An anaerobic fermentation multi-stage stirring system includes a first mounting frame and a second mounting frame. A grinding box is mounted on the upper end of the first mounting frame. The grinding box has a partition that divides the grinding box into a swing chamber and a grinding chamber from left to right. A swing mechanism is installed in the swing chamber, and a grinding mechanism is installed in the grinding chamber. A filter screen is installed on the swing mechanism, and the filter screen and grinding mechanism are correspondingly arranged. A first stirring box is mounted on the second mounting frame. The first stirring box has two stirring chambers. A position adjustment structure is installed in each stirring chamber, and a first stirring mechanism is mounted on the position adjustment mechanism. Two connecting pipes are connected to the lower end of the first stirring box. A second stirring box is mounted on the lower end of the second mounting frame, and the lower ends of the two connecting pipes are connected to the upper end of the second stirring box. A second stirring mechanism is installed in the second stirring box. A negative pressure device is connected to one side of the first stirring box. The grinding box is connected to the first stirring box via a flow guiding structure. The swing mechanism, grinding mechanism, first stirring mechanism, second stirring mechanism, and negative pressure device are all controlled and connected through a DCS control system.

[0007] Preferably, the oscillating mechanism includes a U-shaped rotating rod rotatably connected to one side wall of the oscillating chamber. A connecting ring is sleeved on the U-shaped rotating rod, and a pull rod is connected to the lower end of the connecting ring. A movable plate is rotatably connected to the lower end of the pull rod. A baffle is fixed to one end of the movable plate. An opening is provided on the side wall of the partition. One end of the movable plate passes through the opening and is connected to one side of the filter screen. The baffle and the opening are correspondingly arranged. A first drive motor is fixed to the upper end of the crushing box. A first bevel gear is connected to the end of the output shaft of the first drive motor. A first crushing roller is connected to one end of the U-shaped rotating rod. One end of the first crushing roller passes through the partition and is rotatably connected to one side wall of the crushing chamber. A second bevel gear is fixedly fitted on one side of the first crushing roller, and the second bevel gear and the first bevel gear mesh with each other.

[0008] Preferably, the crushing mechanism includes a second crushing roller rotatably connected to one side wall of the crushing chamber. Multiple first crushing blades are connected at equal intervals around the second crushing roller and the first crushing roller, and two first crushing blades on the same side are arranged crosswise. A fourth drive motor is fixed on one side of the crushing box. The output shaft end of the fourth drive motor is connected to one side of the second crushing roller. A feed hopper is provided at the upper end of the crushing box, and the feed hopper and the first crushing blades are arranged correspondingly.

[0009] Preferably, the position adjustment mechanism includes a flow divider plate fixed in the middle of the first mixing tank. Eight guide rods are fixed to the upper end of the flow divider plate. A mounting block is fixed to the upper end of each guide rod. Two servo motors are fixed to the upper end of the mounting block. A screw is connected to the output shaft of each servo motor. The lower end of the screw is rotatably connected to the upper end of the flow divider plate. A moving block is threaded onto the screw. Four guide rods on the same side are arranged through the four corners of the same moving block. Two second connecting rods are rotatably connected to one side of the moving block. Four first connecting rods are rotatably connected to one side of the mounting block. One end of each of the four first connecting rods and the four second connecting rods is rotatably connected to a mounting plate. The first mixing mechanism is mounted on one side of the mounting plate.

[0010] Preferably, the first stirring mechanism includes a horizontal plate fixed to one end of the mounting plate, two second drive motors are mounted on the upper end of the horizontal plate, the output shafts of the second drive motors are connected to a first stirring rod, and a plurality of first stirring blades are connected at equal intervals around the first stirring rod.

[0011] Preferably, the second stirring mechanism includes a second stirring rod rotatably connected to one end side wall inside the second stirring tank, a plurality of second stirring blades and second crushing blades being connected at equal intervals around the second stirring rod, and a third drive motor being installed on one side of the second stirring tank, the end of the output shaft of the third drive motor being connected to one side of the second stirring rod via a coupling.

[0012] Preferably, the flow guiding structure includes a discharge channel connected to one side of the lower end of the crushing box, and two distribution pipes are inclinedly connected to one side of the upper end of the first mixing box. One end of the two distribution pipes is connected to a connecting hopper, and one end of the discharge channel extends into the connecting hopper.

[0013] Preferably, the negative pressure device includes an air pump installed on one side of the upper end of the second mounting bracket, and one end of the air pump is connected to both sides of the first mixing tank through two air supply and extraction channels.

[0014] Preferably, a T-shaped groove is provided on the side wall at one end of the crushing chamber, a T-shaped slider is installed in the T-shaped groove, and one end of the filter screen is fixed to one side of the T-shaped slider.

[0015] Preferably, a discharge port is provided on one side of the second mixing tank, and a discharge pipe is connected to one end of the discharge port, with a valve provided on the connecting pipe.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1. By combining crushing and shaking mechanisms, the speed of pretreatment of fermentation materials is greatly improved, while ensuring the consistency of the size of the pretreated materials.

[0018] 2. By combining the extended first stirring mechanism with negative pressure short-time fermentation, the fermentation material can be further fluidized quickly, thereby increasing the fermentation speed;

[0019] 3. By combining multi-stage stirring with short-time fermentation, the quality of subsequent fermentation is greatly guaranteed.

[0020] In summary, this invention not only enables rapid pretreatment of fermentation materials and ensures the quality of pretreatment, but also increases the fermentation speed, reduces fermentation costs, and further improves the quality of fermentation. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of a multi-stage stirring system for anaerobic fermentation proposed in this invention;

[0022] Figure 2 This is a schematic diagram of the position adjustment mechanism of a multi-stage stirring system for anaerobic fermentation proposed in this invention;

[0023] Figure 3 This is a schematic diagram of the swaying mechanism structure of a multi-stage stirring system for anaerobic fermentation proposed in this invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of the first mixing tank of an anaerobic fermentation multi-stage mixing system proposed in this invention;

[0025] Figure 5 This is a schematic diagram of the crushing roller configuration structure of an anaerobic fermentation multi-stage stirring system proposed in this invention;

[0026] Figure 6 This is a schematic diagram of the internal structure of the second mixing tank of an anaerobic fermentation multi-stage mixing system proposed in this invention;

[0027] Figure 7 This is a schematic diagram of the distribution pipe structure of a multi-stage stirring system for anaerobic fermentation proposed in this invention;

[0028] Figure 8 This is an enlarged view of section A of the anaerobic fermentation multi-stage stirring system proposed in this invention;

[0029] Figure 9 This is a schematic diagram of the DCS control system connection structure of an anaerobic fermentation multi-stage stirring system proposed in this invention.

[0030] In the diagram: 1. Feed hopper, 2. First drive motor, 3. Discharge channel, 4. Crushing box, 5. Pad, 6. First mounting frame, 7. Air supply and extraction channel, 8. Air pump, 9. Connecting hopper, 10. Distribution pipe, 11. First mixing box, 12. Valve, 13. Connecting pipe, 14. Second mounting frame, 15. Discharge pipe, 16. Second mixing box, 17. Moving block, 18. Mounting plate, 19. Horizontal plate, 20. First mixing blade, 21. Guide rod, 22. Servo motor, 23. Mounting block, 24. Screw, 25. First connecting rod, 26. 27 First stirring rod, 28 Second drive motor, 29 Second stirring rod, 30 Second stirring rod, 31 Third drive motor, 32 First bevel gear, 33 Second bevel gear, 34 U-shaped rotating rod, 35 Pull rod, 36 Moving plate, 37 Baffle, 38 Opening, 39 First crushing blade, 40 First crushing roller, 41 Fourth drive motor, 42 T-shaped slider, 43 Filter screen, 44 T-shaped chute, 45 Second crushing roller, 46 Diverter plate, 47 Second crushing blade. Detailed Implementation

[0031] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0032] Reference Figure 1-9The present invention includes a first mounting frame 6 and a second mounting frame 14. A crushing box 4 is mounted on the upper end of the first mounting frame 6. A partition is provided inside the crushing box 4, which divides the crushing box 4 into a swing chamber and a crushing chamber from left to right. A swing mechanism is provided in the swing chamber, and a crushing mechanism is provided in the crushing chamber. A filter screen 43 is provided on the swing mechanism. The filter screen 43 and the crushing mechanism are correspondingly arranged. One end of the filter screen 43 is connected to a T-shaped slider 42, which can ensure stable up and down movement, thereby improving the filtration effect.

[0033] In this invention, a first mixing tank 11 is mounted on a second mounting bracket 14. The first mixing tank 11 has two mixing chambers, and a position adjustment structure is provided in each mixing chamber. A first mixing mechanism is mounted on the position adjustment mechanism. Two connecting pipes 13 are connected to the lower end of the first mixing tank 11. A second mixing tank 16 is mounted at the lower end of the second mounting bracket 14. The lower ends of the two connecting pipes 13 are connected to the upper end of the second mixing tank 16. A second mixing mechanism is installed in the second mixing tank 16. A negative pressure device is connected to one side of the first mixing tank 11. A crushing tank 4 is connected to the first mixing tank 11 through a flow guiding structure. The swing mechanism, crushing mechanism, first mixing mechanism, second mixing mechanism, and negative pressure device are all controlled and connected through a DCS control system. The operator can remotely control the operation of each mechanism through the DCS control system to start and stop it. At the same time, an alarm is set on each mechanism, which can issue a warning after the set running time is exceeded, reminding the operator to shut down the equipment.

[0034] In this invention, the oscillating mechanism includes a U-shaped rotating rod 34 rotatably connected to one side wall of the oscillating chamber. A connecting ring is sleeved on the U-shaped rotating rod 34, and a pull rod 35 is connected to the lower end of the connecting ring. A movable plate 36 is rotatably connected to the lower end of the pull rod 35. A baffle 37 is fixed to one end of the movable plate 36. An opening 38 is provided on the side wall of the baffle. One end of the movable plate 36 passes through the opening 38 and is connected to one side of the filter screen 43. The baffle 37 and the opening 38 are correspondingly arranged. A first drive motor 2 is fixed to the upper end of the crushing box 4. The output shaft of the first drive motor 2 is connected to... A first bevel gear 32 is connected to one end of a U-shaped rotating rod 34, which is connected to a first crushing roller 40. One end of the first crushing roller 40 passes through a partition and is rotatably connected to one side wall of the crushing chamber. A second bevel gear 33 is fixedly mounted on one side of the first crushing roller 40, and the second bevel gear 33 and the first bevel gear 32 mesh with each other. The swing mechanism can improve the crushing force and quality of the material by lifting the filter screen 43, and at the same time, it can ensure that the material that meets the filter screen aperture passes through quickly, thereby reducing the crushing time and ensuring the crushing quality.

[0035] In this invention, the crushing mechanism includes a second crushing roller 45 rotatably connected to one side wall of the crushing chamber. Multiple first crushing blades 39 are connected at equal intervals around the second crushing roller 45 and the first crushing roller 40, and two first crushing blades 39 on the same side are arranged crosswise. A fourth drive motor 41 is fixed on one side of the crushing box 4. The output shaft end of the fourth drive motor 41 is connected to one side of the second crushing roller 45. A feed hopper 1 is provided at the upper end of the crushing box 4, and the feed hopper 1 and the first crushing blades 39 are arranged correspondingly. The two crushing rollers on the crushing mechanism are arranged opposite each other and rotate towards the center at the same time, which can improve the crushing effect and accelerate the crushing speed and throughput of materials.

[0036] In this invention, the position adjustment mechanism includes a flow divider plate 46 fixed in the middle of the first mixing tank 11. Eight guide rods 21 are fixed at the upper end of the flow divider plate 46. A mounting block 23 is fixed at the upper end of the guide rods 21. Two servo motors 22 are fixed at the upper end of the mounting block 23. A screw 24 is connected to the end of the output shaft of the servo motor 22. The lower end of the screw 24 is rotatably connected to the upper end of the flow divider plate 46. A moving block 17 is threaded onto the screw 24. Four guide rods 21 on the same side are arranged through the four corners of the same moving block 17. Two second connecting rods 26 are rotatably connected to one side of the moving block 17. Four first connecting rods 25 are rotatably connected to one side of the mounting block 23. One end of the four first connecting rods 25 and the four second connecting rods 26 are rotatably connected to a mounting plate 18. The first mixing mechanism is installed on one side of the mounting plate 18. The two servo motors 22 installed on the position adjustment mechanism are controlled by a synchronous control system, which can achieve simultaneous and precise forward rotation and simultaneous and precise reverse rotation.

[0037] In this invention, the first stirring mechanism includes a horizontal plate 19 fixed to one end of the mounting plate 18. Two second drive motors 28 are installed at the upper end of the horizontal plate 19. The output shaft of the second drive motor 28 is connected to a first stirring rod 27. Multiple first stirring blades 20 are connected at equal intervals around the first stirring rod 27. The first stirring mechanism is a fixed stirring mechanism, which can change its position by adjusting the position adjustment mechanism, thereby expanding its stirring range and area.

[0038] In this invention, the second stirring mechanism includes a second stirring rod 29 rotatably connected to one end of the side wall inside the second stirring box 16. A plurality of second stirring blades 30 and second crushing blades 47 are connected at equal intervals around the second stirring rod 29. A third drive motor 31 is installed on one side of the second stirring box 16. The output shaft end of the third drive motor 31 is connected to one side of the second stirring rod 29 through a coupling. The stirring blades and crushing blades on the second stirring mechanism can improve the stirring effect and break up the clumps of material, thereby further improving the quality and effect of fermentation.

[0039] In this invention, the flow guiding structure includes a discharge channel 3 connected to the lower side of the crushing box 4, and two distribution pipes 10 are inclinedly connected to the upper side of the first mixing box 11. One end of the two distribution pipes 10 is connected to a connecting hopper 9. One end of the discharge channel 3 extends into the connecting hopper 9. The flow guiding structure is used to transport the crushed material into the two mixing chambers in the first mixing box 11 to achieve zoned mixing and fermentation.

[0040] In this invention, the negative pressure device includes an air pump 8 installed on one side of the upper end of the second mounting bracket 14. One end of the air pump 8 is connected to both sides of the first mixing box 11 through two air supply and extraction channels 7. The negative pressure device adopts an air suction vortex pump with a power of 18.5KW, a speed of 2850, a current of 37A, and a weight of 126Kg.

[0041] In this invention, a T-shaped groove 44 is provided on the side wall of one end of the crushing chamber, and a T-shaped slider 42 is installed in the T-shaped groove 44. One end of the filter screen 43 is fixed to one side of the T-shaped slider 42. A discharge port is provided on one side of the second mixing box 16, and a discharge pipe 15 is connected to one end of the discharge port. A valve 12 is provided on the connecting pipe 13 to control the opening and closing of the connecting pipe 13. The valve 12 is a solenoid valve and is controlled by a DCS control system.

[0042] In this invention, when pretreatment is required before fermentation, the corresponding raw materials are fed into the feed hopper 1 using a conveyor belt. The first drive motor 2 drives the first bevel gear 32 to rotate and the second bevel gear 33 to rotate via the rotation of its output shaft, thereby rotating the first crushing roller 40. Simultaneously, it drives the U-shaped rotating rod 34 to rotate. As the U-shaped rotating rod 34 rotates, it drives the pull rod 35 to move up and down with the connecting ring, which in turn drives the moving plate 36 and the filter screen 43 to move up and down. In addition, the fourth drive motor 41 drives the second crushing roller 45 to rotate via the rotation of its output shaft. The two crushing rollers rotate in opposite directions, and the first crushing blades 39 are staggered. After the raw materials are crushed, they can be lifted up by the filter screen 43 and crushed again until the size of the crushed material matches the mesh diameter of the filter screen 43. After that, the material that matches the mesh diameter falls into the connecting hopper 9 through the discharge channel 3. Inside, the connecting hopper 9 disperses the material into two mixing chambers within the first mixing box 11 via two distributing pipes 10. Two servo motors 22 drive the screw 24 to rotate via the forward and reverse rotation of the output shaft, thereby moving the moving block 17 up and down. As the moving block 17 moves, it causes the horizontal plate 19 to tilt and move up and down, thus expanding the mixing range of the first mixing mechanism. The valve of the distributing pipe 10 is closed, and the vacuum pump 8 uses the air supply and extraction channel 7 to create a vacuum in the first mixing box 11. After fermentation in the first mixing box 11 for 1-2 days, the connecting pipe 13 is opened to put the fermented material into the second mixing box 16. Then, the third drive motor 31 is started to drive the second mixing rod 29 to stir. The second crushing blade 47 further breaks down and disperses large impurities. After thorough stirring, the material is pumped into the corresponding fermentation tank through the discharge pipe 15 for fermentation.

[0043] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. An anaerobic fermentation multi-stage stirring system, comprising a first mounting frame (6) and a second mounting frame (14), characterized in that: A crushing box (4) is installed on the upper end of the first mounting frame (6). The crushing box (4) is provided with a partition, which divides the crushing box (4) into a swing chamber and a crushing chamber from left to right. A swing mechanism is provided in the swing chamber, and a crushing mechanism is provided in the crushing chamber. A filter screen (43) is provided on the swing mechanism. The filter screen (43) and the crushing mechanism are arranged correspondingly. A first stirring box (11) is installed on the second mounting frame (14). The first stirring box (11) is provided with two stirring chambers. A position adjustment mechanism is provided in the stirring chamber. A first stirring mechanism is installed on the position adjustment mechanism. The mixing mechanism has two connecting pipes (13) connected to the lower end of the first mixing box (11), and a second mixing box (16) is provided at the lower end of the second mounting bracket (14). The lower ends of the two connecting pipes (13) are connected to the upper end of the second mixing box (16). A second mixing mechanism is installed inside the second mixing box (16). A negative pressure device is connected to one side of the first mixing box (11). The crushing box (4) is connected to the first mixing box (11) through a flow guiding structure. The swaying mechanism, crushing mechanism, first mixing mechanism, second mixing mechanism and negative pressure device are all controlled and connected through a DCS control system. The swing mechanism includes a U-shaped rotating rod (34) rotatably connected to one side wall of the swing cavity. A connecting ring is sleeved on the U-shaped rotating rod (34). A pull rod (35) is connected to the lower end of the connecting ring. A movable plate (36) is rotatably connected to the lower end of the pull rod (35). A baffle (37) is fixed to one end of the movable plate (36). An opening (38) is provided on the side wall of the baffle. One end of the movable plate (36) passes through the opening (38) and is connected to one side of the filter screen (43). The baffle (37) and the opening (38) are connected together. In the corresponding configuration, a first drive motor (2) is fixed at the upper end of the crushing box (4), and a first bevel gear (32) is connected to the end of the output shaft of the first drive motor (2). One end of the U-shaped rotating rod (34) is connected to a first crushing roller (40). One end of the first crushing roller (40) passes through the partition and is rotatably connected to one side wall of the crushing chamber. A second bevel gear (33) is fixedly fitted on one side of the first crushing roller (40), and the second bevel gear (33) and the first bevel gear (32) mesh with each other.

2. The anaerobic fermentation multi-stage stirring system according to claim 1, characterized in that: The crushing mechanism includes a second crushing roller (45) rotatably connected to one side wall of the crushing chamber. Multiple first crushing blades (39) are connected at equal intervals around the second crushing roller (45) and the first crushing roller (40), and two first crushing blades (39) on the same side are arranged crosswise. A fourth drive motor (41) is fixed on one side of the crushing box (4). The output shaft end of the fourth drive motor (41) is connected to one side of the second crushing roller (45). A feed hopper (1) is provided at the upper end of the crushing box (4), and the feed hopper (1) and the first crushing blades (39) are arranged correspondingly.

3. The anaerobic fermentation multi-stage stirring system according to claim 1, characterized in that: The position adjustment mechanism includes a flow divider plate (46) fixed in the middle of the first mixing tank (11). Eight guide rods (21) are fixed to the upper end of the flow divider plate (46). An mounting block (23) is fixed to the upper end of each guide rod (21). Two servo motors (22) are fixed to the upper end of the mounting block (23). A screw (24) is connected to the end of the output shaft of each servo motor (22). The lower end of the screw (24) is rotatably connected to the upper end of the flow divider plate (46). The moving block (17) is threaded onto the upper part of the mounting block (23). Four guide rods (21) on the same side are inserted through the four corners of the same moving block (17). Two second connecting rods (26) are rotatably connected to one side of the moving block (17). Four first connecting rods (25) are rotatably connected to one side of the mounting block (23). One end of the four first connecting rods (25) and the four second connecting rods (26) are rotatably connected to the mounting plate (18). The first stirring mechanism is installed on one side of the mounting plate (18).

4. The anaerobic fermentation multi-stage stirring system according to claim 1, characterized in that: The first stirring mechanism includes a horizontal plate (19) fixed to one end of the mounting plate (18). Two second drive motors (28) are installed at the upper end of the horizontal plate (19). The output shaft of the second drive motor (28) is connected to a first stirring rod (27). Multiple first stirring blades (20) are connected at equal intervals around the first stirring rod (27).

5. The anaerobic fermentation multi-stage stirring system according to claim 1, characterized in that: The second stirring mechanism includes a second stirring rod (29) rotatably connected to one side wall of the second stirring box (16). A plurality of second stirring blades (30) and second crushing blades (47) are connected at equal intervals around the second stirring rod (29). A third drive motor (31) is installed on one side of the second stirring box (16). The end of the output shaft of the third drive motor (31) is connected to one side of the second stirring rod (29) through a coupling.

6. The anaerobic fermentation multi-stage stirring system according to claim 1, characterized in that: The flow guiding structure includes a discharge channel (3) connected to the lower side of the crushing box (4), and two distribution pipes (10) are inclinedly connected to the upper side of the first mixing box (11). One end of the two distribution pipes (10) is connected to a connecting hopper (9), and one end of the discharge channel (3) extends into the connecting hopper (9).

7. The anaerobic fermentation multi-stage stirring system according to claim 1, characterized in that: The negative pressure device includes an air pump (8) installed on one side of the upper end of the second mounting bracket (14), one end of which is connected to both sides of the first mixing tank (11) through two air supply and extraction channels (7).

8. The anaerobic fermentation multi-stage stirring system according to claim 1, characterized in that: A T-shaped groove (44) is provided on the side wall of one end of the crushing chamber. A T-shaped slider (42) is installed in the T-shaped groove (44). One end of the filter screen (43) is fixed to one side of the T-shaped slider (42).

9. The anaerobic fermentation multi-stage stirring system according to claim 1, characterized in that: The second mixing tank (16) has a discharge port on one side, and one end of the discharge port is connected to a discharge pipe (15). A valve (12) is provided on the connecting pipe (13).

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