Multistage solid-liquid separation structure for livestock and poultry manure anaerobic fermentation device

Abstract

The invention relates to the technical field of livestock and poultry manure treatment, in particular to a multi-stage solid-liquid separation structure for a livestock and poultry manure anaerobic fermentation device. The structure comprises a fermentation structure and a screw extruder, a multi-stage continuous separation mechanism is arranged at the feeding end of the screw extruder, and the multi-stage continuous separation mechanism comprises a feeding hopper, a primary separation grating, a separation barrel, a rotatable filter plate and a matched solid guide-out structure and is used for carrying out step-by-step solid-liquid separation on livestock and poultry manure; the filter plate is driven by the driving shaft to rotate and is matched with the inclined scraping rod and the discharging guide plate, so that continuous discharging of solid feces is realized; meanwhile, a flushing mechanism is arranged on one side of the separation cylinder, and a filter plate is flushed through a swinging water pipe and a spray head, so that blockage is reduced, and the separation efficiency is kept; a liquid collecting tray and a water receiving tray are arranged in the separating cylinder and are used for collecting separated liquid and flushing sewage and leading out the liquid and the flushing sewage.

Description

Technical Field

[0001] This invention belongs to the field of bio-fermentation technology, specifically relating to a multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure. Background Technology

[0002] Livestock and poultry manure typically has high water content, complex solid particle composition, and high fiber and impurity content. To improve anaerobic fermentation efficiency and ensure stable operation of the fermentation system, solid-liquid separation treatment is usually required before the manure enters the anaerobic fermentation unit. This makes the liquid phase more suitable for anaerobic microbial metabolism and reduces the risk of solid material deposition and clogging in the fermenter. In existing technologies, solid-liquid separation of livestock and poultry manure often adopts a single form of grid filtration, screen filtration, or screw extrusion separation. Some solutions rely solely on a screw extruder to directly treat the raw manure, or use a simple grid structure at the feed end to intercept large-sized impurities.

[0003] However, in practical applications, livestock and poultry manure often contains large-sized impurities, fibrous materials, and easily adherent fine solid particles. Relying solely on single-stage grids or single extrusion separation methods can easily lead to limited pretreatment effects before entering the extrusion equipment, thereby increasing the load on the screw extruder and affecting its stable operation. Meanwhile, in some existing filtration separation structures, during continuous operation, the surface of the filter components is easily covered or clogged by solid manure, resulting in a gradual decrease in separation efficiency and requiring frequent shutdowns for cleaning, which fails to meet the continuity and stability requirements of anaerobic fermentation systems.

[0004] Furthermore, most existing filtration devices for pre-separation of feces and sewage employ static filtration structures. Solid materials accumulate on the filter surface and are difficult to remove promptly, easily leading to localized blockages or incomplete separation. Even when flushing devices are included, their flushing angles and effective ranges are often fixed, making it difficult to effectively clean different areas of the filter components, thus affecting long-term performance. Simultaneously, some existing solutions lack sufficient ability to adjust the water content of the separated liquid during solid-liquid separation, making it difficult to flexibly control the process according to the needs of subsequent dry or wet anaerobic fermentation processes. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention aims to provide a multi-stage solid-liquid separation structure for anaerobic fermentation of livestock and poultry manure. Through a rationally structured and continuously operating multi-stage solid-liquid separation method, it achieves the step-by-step separation of solids of different particle sizes in manure, effectively prevents clogging of filter components during the separation process, and simultaneously considers separation efficiency and adaptability to subsequent fermentation processes.

[0006] To achieve the above objectives, the present invention provides the following technical solution: A multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure includes a fermentation structure and a screw extruder. The fermentation structure includes a base, a fermentation tank is fixed on the top of the base, the screw extruder is placed on one side of the fermentation structure, and a conveying pipe is installed at the liquid outlet end of the screw extruder. The end of the conveying pipe is connected to the fermentation structure. The upper surface of the screw extruder is provided with a feed inlet, and the top of the screw extruder is provided with a multi-stage continuous separation mechanism. The multi-stage continuous separation mechanism is used to perform preliminary separation of the manure entering the screw extruder. The multi-stage continuous separation mechanism includes a separation cylinder, the top of the separation cylinder is provided with a feed hopper, the feed hopper is located directly above the feed inlet, and the end of the feed hopper is provided with a primary separation grid. A drive shaft is rotatably mounted inside the separation cylinder, and a filter plate is fixed at the bottom of the drive shaft. The filter plate is used for intermediate separation of feces and sewage. A flushing mechanism is provided on one side of the separation cylinder.

[0007] Furthermore, a discharge guide plate is provided on the front side of the separation cylinder, the discharge guide plate is flush with the upper surface of the filter plate, and an inclined scraper is fixed inside the separation cylinder, the inclined scraper is used to guide the solid fecal matter on the surface of the filter plate onto the discharge guide plate.

[0008] Furthermore, a V-shaped baffle is fixed inside the separation cylinder, the V-shaped baffle is positioned above the filter plate, and the outlet of the feed hopper is positioned above the inside of the V-shaped baffle.

[0009] Furthermore, a notch is provided below the side of the V-shaped baffle near the discharge guide plate, through which the solid waste separated by the filter plate moves out of the range of the V-shaped baffle.

[0010] Furthermore, a liquid collection tray is fixed inside the separation cylinder, the liquid collection tray is placed below the filter plate, and a material port is opened at the bottom of the liquid collection tray, the material port coincides with the feed port.

[0011] Furthermore, a drive base is fixed to the top of the separation cylinder, and the top of the drive shaft is mounted on the output end of the drive base. The rinsing mechanism includes a support base fixed to the upper surface of the separation cylinder and a water pipe rotating inside the separation cylinder on one side.

[0012] Furthermore, the water pipe is placed above the filter plate, and the water pipe and the feed inlet are respectively placed on the left and right sides of the drive shaft. Spray nozzles are evenly arranged below the surface of the water pipe, and multiple spray nozzles are used to rinse the filter plate. The outer end of the water pipe is connected to a high-pressure water pump.

[0013] Furthermore, a rotating shaft is rotatably passed through the inner side of the support base. One end of the rotating shaft is provided with a second conical tooth and the other end is provided with a turntable. The output end of the drive base is equipped with a first conical tooth, and the first conical tooth and the second conical tooth mesh with each other.

[0014] Furthermore, a swing rod is vertically installed at the outer end of the water pipe, a U-shaped groove is opened on the surface of the swing rod, and an eccentric block is installed on the end face of the turntable, with the eccentric block placed inside the U-shaped groove.

[0015] Furthermore, the rinsing mechanism also includes a water receiving tray fixed and penetrating the surface of the separation cylinder. The water receiving tray is placed below the filter plate and corresponds to the position of the water pipe. The water receiving tray is used to draw out the rinsing wastewater.

[0016] Compared with the prior art, the beneficial effects of the present invention are: To address the problem that existing livestock and poultry manure systems rely solely on a single separation method before entering the anaerobic fermentation system, which easily leads to the entrainment of large-sized impurities and high-solids materials, increasing the screw extrusion load and affecting the stability of continuous equipment operation, this technical solution incorporates a multi-stage continuous separation mechanism at the feed end of the screw extruder. The primary separation grid at the end of the feed hopper pre-filters the livestock and poultry manure, followed by intermediate separation using filter plates inside the separation cylinder. This allows solid impurities of different particle sizes to be intercepted and separated step-by-step before entering the screw extruder, structurally reducing the solids content entering the extrusion separation stage. This reduces the workload of the screw extruder and improves the overall stability of solid-liquid separation.

[0017] Addressing the issue that existing filtration separation structures are mostly static filters, where solid waste easily accumulates on the filter surface, leading to clogging and reduced separation efficiency, this technical solution uses a drive shaft to rotate the filter plate, enabling the solid-liquid separation process to proceed dynamically. Combined with the cooperation of the inclined scraper and the discharge guide plate, solid waste on the filter plate surface is continuously discharged from the separation area, preventing solids from remaining on the filter surface for extended periods. This achieves continuous separation operations and improves the efficiency and reliability of intermediate solid-liquid separation.

[0018] To address the issues of splashing and disordered separation zones during the separation process of fecal waste, which can affect the separation effect, this technical solution involves installing a V-shaped baffle above the filter plate and arranging the feed hopper outlet above the inner side of the V-shaped baffle. The baffle structure limits the falling path of the fecal waste, and a notch is provided on the side of the baffle near the discharge guide plate, allowing the separated solid fecal waste to move out of the baffle area in an orderly manner and enter the discharge guide plate. This ensures the stability of the separation zone while achieving smooth discharge of solid fecal waste.

[0019] To address the problem that existing separation devices are prone to filter pore blockage by fine solids during long-term operation and require frequent cleaning and maintenance, this technical solution sets up a rinsing mechanism on one side of the separation cylinder. The mechanism drives the water pipe to swing back and forth through the drive base and uses nozzles to spray high-pressure water flow onto different angle areas of the filter plate to continuously rinse the surface of the filter plate. This structurally reduces the occurrence of filter pore blockage and ensures the continuity and efficiency of the solid-liquid separation process.

[0020] To address the problem that existing solid-liquid separation systems cannot flexibly adjust the moisture content according to subsequent dry or wet anaerobic fermentation processes, this technical solution sets up a liquid collection tray and a water receiving tray inside the separation cylinder to centrally collect and drain the separated liquid and the wastewater generated during rinsing. This makes it easier to control the moisture content of the material entering the screw extruder and fermentation tank, thereby improving the compatibility of livestock and poultry manure with subsequent anaerobic fermentation processes. Attached Figure Description

[0021] Figure 1 This is a front view structural diagram of the present invention; Figure 2 This is a three-dimensional structural diagram of the present invention; Figure 3 This is a schematic diagram of the thread extrusion press structure of the present invention; Figure 4 For the present invention Figure 3 A schematic diagram of the cross-sectional structure; Figure 5 This is a schematic diagram of the multi-stage continuous separation mechanism of the present invention; Figure 6 For the present invention Figure 5 A schematic diagram of the cross-sectional structure; Figure 7 This is a three-dimensional structural diagram of the flushing mechanism of the present invention. Figure 8 This is a three-dimensional structural diagram of the liquid collection plate of the present invention; Figure 9 This is a three-dimensional structural diagram of the V-shaped baffle of the present invention.

[0022] The attached diagram lists the components represented by each number as follows: 1. Fermentation structure; 11. Base; 12. Fermentation tank; 2. Screw extruder; 21. Conveying pipe; 22. Feed inlet; 3. Multi-stage continuous separation mechanism; 31. Separation cylinder; 32. Feed hopper; 33. Primary separation grid; 34. Discharge guide plate; 35. Liquid collection tray; 351. Feed port; 36. Drive shaft; 37. Filter plate; 38. V-shaped baffle; 381. Notch; 39. Inclined scraper; 310. Drive base; 311. First conical tooth; 4. Flushing mechanism; 41. Support base; 42. Water pipe; 421. Nozzle; 43. Swing rod; 44. U-shaped groove; 45. Rotating shaft; 46. Second conical tooth; 47. Turntable; 48. Eccentric block; 49. Water receiving tray. Detailed Implementation

[0023] To make the objectives and advantages of this invention clearer, the invention will be specifically described below with reference to embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of the invention and does not strictly limit the scope of protection specifically claimed by the invention. Example

[0024] See Figure 1-9 A multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure includes a fermentation structure 1 and a screw extruder 2. The fermentation structure 1 includes a base 11, with a fermentation tank 12 fixed on the top of the base 11. The base 11 provides stable support for the fermentation tank 12 to meet the overall stability requirements during anaerobic fermentation. The fermentation tank 12 is used to perform anaerobic fermentation on the liquid manure after solid-liquid separation. The screw extruder 2 is placed on one side of the fermentation structure 1. The screw extruder 2 is used to further extrude and separate the manure after preliminary separation to reduce the solid content. A conveying pipe 21 is installed at the liquid outlet end of the screw extruder 2. The conveying pipe 21 is used to transport the liquid manure separated by the screw extruder 2 to the inside of the fermentation tank 12. The end of the conveying pipe 21 is connected to the fermentation structure 1 to achieve continuous connection between the liquid manure and the anaerobic fermentation process. The upper surface of the screw extruder 2 is provided with a feed inlet 22, which is used to receive the pre-separated manure from the multi-stage continuous separation mechanism 3. The multi-stage continuous separation mechanism 3 is set at the top of the screw extruder 2 to solve the problem that direct feeding easily carries large-sized impurities, which affects the stability of the extrusion and separation. The multi-stage continuous separation mechanism 3 is used to perform step-by-step pre-treatment separation of the manure entering the screw extruder 2 to reduce the load of subsequent separation. The multi-stage continuous separation mechanism 3 includes a separation cylinder 31, which is used to form a relatively closed separation space to ensure the continuity and stability of the separation process. A feed hopper 32 is set at the top of the separation cylinder 31, which is used to guide the livestock and poultry manure into the separation cylinder 31. The feed hopper 32 is placed directly above the feed inlet 22 to ensure that the separated material can smoothly enter the screw extruder 2. A primary separation grid 33 is set at the end of the feed hopper 32, which is used to intercept large-volume impurities and fibrous materials before the manure enters the separation cylinder 31 to reduce the risk of clogging in the subsequent filtration and extrusion process. A drive shaft 36 is rotatably mounted inside the separation cylinder 31. The drive shaft 36 provides rotational power to the intermediate separation structure to achieve continuous separation. A filter plate 37 is fixed at the bottom of the drive shaft 36. The filter plate 37 is used to perform intermediate solid-liquid separation on the fecal sludge after primary separation to further reduce the solid content in the liquid. The filter plate 37 reduces the accumulation of solids on the filter surface by rotation to solve the problem of easy clogging in static filtration. A rinsing mechanism 4 is provided on one side of the separation cylinder 31. The rinsing mechanism 4 is used to clean the filter plate 37 during the separation process to prevent the filter holes from being blocked by solid fecal sludge and affecting the separation efficiency.

[0025] See Figure 3-6 A discharge guide plate 34 is provided on the front side of the separation cylinder 31. The discharge guide plate 34 is used to guide the solid fecal waste removed from the surface of the filter plate 37 in a concentrated manner to achieve orderly discharge. The discharge guide plate 34 is flush with the upper surface of the filter plate 37 to ensure that the solid fecal waste can smoothly enter the guide path under the action of gravity. An inclined scraper 39 is fixed inside the separation cylinder 31. The inclined scraper 39 is used to scrape off the solid fecal waste attached to the surface of the filter plate 37 during the rotation of the filter plate 37. The relative position of the inclined scraper 39 and the filter plate 37 is matched to guide the solid fecal waste to the discharge guide plate 34, thereby avoiding solids from staying on the surface of the filter plate 37 for a long time and causing blockage.

[0026] See Figure 3-6 A V-shaped baffle 38 is fixed inside the separation cylinder 31. The V-shaped baffle 38 is used to guide and shield the manure in the feeding area to prevent splashing during the fall of the manure and affect the separation environment. The V-shaped baffle 38 is placed above the filter plate 37 to limit the main working area of ​​solid-liquid separation. The outlet of the feed hopper 32 is located above the inside of the V-shaped baffle 38 so that the manure can be effectively confined within the baffle range when entering the separation area, thereby improving the stability of the separation process.

[0027] See Figure 3-6 The V-shaped baffle 38 has a notch 381 on the side below the discharge guide plate 34. The notch 381 is used to provide a channel for the solid waste separated by the filter plate 37 to move out of the range of the V-shaped baffle 38 through the notch 381 and into the discharge guide plate 34, thereby achieving effective separation of solid waste from the separation area to avoid re-mixing with the liquid phase.

[0028] See Figure 3-9 A liquid collection tray 35 is fixed inside the separator 31. The liquid collection tray 35 is used to collect the liquid sewage falling through the filter plate 37 to prevent the liquid from flowing randomly inside the separator 31. The liquid collection tray 35 is placed below the filter plate 37 to correspond to the path of the filtrate falling. A feed port 351 is opened at the bottom of the liquid collection tray 35. The feed port 351 is used to guide the collected liquid sewage into the screw extruder 2. The feed port 351 coincides with the feed inlet 22 to ensure that the liquid sewage can enter the screw extruder 2 smoothly without accumulation.

[0029] See Figure 4-6The top of the separation cylinder 31 is fixed with a drive base 310, which provides a stable power source for the drive shaft 36. The top of the drive shaft 36 is mounted on the output end of the drive base 310 to achieve continuous rotation of the drive shaft 36. The rinsing mechanism 4 includes a support base 41 fixed on the upper surface of the separation cylinder 31. The support base 41 is used to install and support the moving parts in the rinsing mechanism 4. The rinsing mechanism 4 also includes a water pipe 42 rotating inside the separation cylinder 31. The water pipe 42 is used to transport rinsing water to clean the filter plate 37.

[0030] See Figure 5-7 Water pipe 42 is placed above filter plate 37 to cover the main separation area of ​​filter plate 37. Water pipe 42 and feed inlet 22 are respectively placed on the left and right sides of drive shaft 36 to avoid mutual interference and ensure reasonable structural arrangement. Spray nozzles 421 are evenly arranged below the surface of water pipe 42. Multiple spray nozzles 421 are used to evenly spray rinsing water onto the surface of filter plate 37 to remove attached solid fecal matter. The outer end of water pipe 42 is connected to high pressure water pump to provide stable rinsing water pressure for spray nozzles 421.

[0031] See Figure 4-7 A rotating shaft 45 is rotatably passed through the inner side of the support base 41. The rotating shaft 45 is used to transmit the power of the drive base 310 to the rinsing swing structure. A second conical tooth 46 is provided at one end of the rotating shaft 45 and a turntable 47 is provided at the other end. A first conical tooth 311 is installed at the output end of the drive base 310. The first conical tooth 311 and the second conical tooth 46 mesh with each other to realize the power direction conversion and drive the turntable 47 to rotate.

[0032] See Figure 7 A swing rod 43 is vertically installed at the outer end of the water pipe 42. The swing rod 43 is used to convert the rotational motion of the turntable 47 into the reciprocating swing of the water pipe 42. A U-shaped groove 44 is opened on the surface of the swing rod 43 to form an eccentric transmission structure. An eccentric block 48 is provided on the end face of the turntable 47. The eccentric block 48 is placed inside the U-shaped groove 44 to push the swing rod 43 to reciprocate during the rotation of the turntable 47, so that the water pipe 42 washes the filter plate 37 within different angle ranges.

[0033] See Figure 5-7 The rinsing mechanism 4 also includes a water receiving tray 49 fixed and penetrating the surface of the separation cylinder 31. The water receiving tray 49 is used to collect and drain the sewage generated during the rinsing process. The water receiving tray 49 is placed below the filter plate 37 to correspond to the rinsing area of ​​the nozzle 421. The position of the water receiving tray 49 corresponds to that of the water pipe 42 to improve the sewage collection efficiency. The water receiving tray 49 is used to drain the rinsing sewage so that the water content of the manure can be adjusted according to the requirements of the subsequent anaerobic fermentation process. Example

[0034] See Figure 1-3To address the issues of high solid impurity entrainment and high extrusion load before entering the screw extruder, this embodiment sets up a multi-stage continuous separation mechanism 3 above the screw extruder 2. The mechanism achieves step-by-step pre-separation of manure and sewage through a structural superposition method. Specifically, it includes a fermentation structure 1, a screw extruder 2, a separation cylinder 31, a feed hopper 32, and a primary separation grid 33. Fermentation structure 1 includes a base 11 and a fermentation tank 12 fixed on the top of the base 11. The base 11 is welded from Q235 carbon steel, and the fermentation tank 12 is a carbon steel tank structure with an inner anti-corrosion layer. The screw extruder 2 is a solid-liquid extrusion equipment of model LXJ-300, and the upper surface of the screw extruder 2 is provided with a feed port 22; The separator 31 is fixed to the top of the screw extruder 2. The separator 31 is made of stainless steel 304 to adapt to high humidity and high corrosion environment. The feed hopper 32 is located at the top of the separator cylinder 31. A primary separation grid 33 is provided at the end of the feed hopper 32. The primary separation grid 33 adopts a stainless steel bar grid structure with a bar spacing of 15-25mm, which is used to intercept large-sized impurities such as straw and plastic. During operation, livestock and poultry manure is first pre-filtered through the primary separation grid 33, and then the filtered manure enters the separation cylinder 31, reducing the content of solid impurities entering the screw extruder 2 from the source, thereby reducing the operating load of the screw extruder 2.

[0035] Without the multi-stage continuous separation mechanism 3, livestock and poultry manure directly enters the screw extruder 2 through the feed inlet 22. During operation, the screw blades are easily entangled by long fibrous materials, the motor current fluctuates significantly, and the equipment needs to be stopped frequently for cleaning. In contrast, the structure of this embodiment can significantly improve the stability of the extrusion operation. Example

[0036] See Figure 3-6 To address the issues of easy clogging and unstable separation efficiency in static filtration structures, this embodiment achieves continuous intermediate separation through the cooperation of a rotating filter plate 37 and an outlet structure. Specifically, it includes a separation cylinder 31, a drive shaft 36, a filter plate 37, an inclined scraper 39, and a discharge guide plate 34. The drive shaft 36 is vertically arranged inside the separator 31. The drive shaft 36 is made of 40Cr tempered steel. The lower end of the drive shaft 36 is fixedly connected to the disc filter plate 37. Filter plate 37 adopts a stainless steel sieve structure with a sieve aperture of 2-4mm, and is used for intermediate solid-liquid separation of fecal sludge after primary separation. The drive shaft 36 is driven by the drive base 310 to rotate slowly at a speed of 3-6 r / min; An inclined scraper 39 is fixed inside the separator 31. The inclined scraper 39 is made of wear-resistant polyurethane material and forms a scraping fit with the surface of the filter plate 37. A discharge guide plate 34 is provided on the front side of the separation cylinder 31. The discharge guide plate 34 is flush with the upper surface of the filter plate 37, so that the solid fecal waste scraped off can be discharged smoothly under the action of gravity.

[0037] When using a fixed planar filter screen for separation, solids gradually accumulate on the top of the filter screen, and the separation efficiency decreases significantly with running time. However, in this embodiment, the separation efficiency remains stable through the rotating filter plate 37 and the continuous scraping structure of the inclined scraper 39. Example

[0038] See Figure 3-6 To address the issues of severe splashing and disordered separation zone during the fall of feces and sewage, this embodiment achieves stable control of the separation zone through the structural cooperation of V-shaped baffle 38 and notch 381, specifically including V-shaped baffle 38, notch 381 and feed hopper 32; V-shaped baffle 38 is fixed inside the separation cylinder 31. V-shaped baffle 38 is made of stainless steel plate bent into shape, and the V-shaped angle is 60-90°. The outlet of the feed hopper 32 is located above the inner side of the V-shaped baffle 38, so that the sewage flows down along the inner side of the baffle. The V-shaped baffle 38 has a notch 381 on the side below the discharge guide plate 34. The notch 381 is used to provide a directional discharge channel for the solid waste separated by the filter plate 37. The V-shaped baffle 38 guides and blocks the flow, keeping the separation area relatively closed, while the gap 381 allows for the orderly discharge of solids.

[0039] Without the V-shaped baffle 38, the sewage is prone to splashing and scattering during its fall, and some solids fall back into the liquid phase region, affecting the separation effect. This embodiment can significantly improve the separation stability. Example

[0040] See Figure 4-7 To address the issue of filter plate 37 becoming clogged during prolonged operation, this embodiment employs a swing-type rinsing mechanism 4 to clean the filter plate 37 from multiple angles. Specifically, it includes a water pipe 42, a nozzle 421, a support base 41, a rotating shaft 45, a first conical tooth 311, a second conical tooth 46, a turntable 47, an eccentric block 48, a swing rod 43, and a U-shaped groove 44. Water pipe 42 is made of seamless stainless steel pipe, and a high-pressure water pump of model GW-50 is connected to the outside of water pipe 42; Multiple nozzles 421 are evenly arranged below the water pipe 42, and the nozzles 421 are fan-shaped high-pressure nozzles. The first bevel tooth 311 at the output end of the drive base 310 meshes with the second bevel tooth 46 at the end of the rotating shaft 45, driving the turntable 47 to rotate. The eccentric block 48 on the end face of the turntable 47 is embedded in the U-shaped groove 44 on the surface of the swing rod 43, so that the swing rod 43 drives the water pipe 42 to swing back and forth, thereby rinsing different areas on the surface of the filter plate 37.

[0041] When a fixed spray pipe structure is used, the rinsing angle is limited, and some filter holes cannot be effectively cleaned for a long time. However, this embodiment can significantly reduce the probability of filter hole clogging. Example

[0042] See Figure 5-9 To address the problem that the moisture content of the separated material is difficult to match with different anaerobic fermentation processes, this embodiment uses a liquid collection tray 35 and a water receiving tray 49 to centrally collect and regulate the liquid. Specifically, it includes a liquid collection tray 35, a material inlet 351, and a water receiving tray 49. The liquid collection tray 35 is fixed inside the separation cylinder 31 and located below the filter plate 37. The liquid collection tray 35 is made of stainless steel 304 material. The bottom of the liquid collection tray 35 is provided with a material port 351, which coincides with the feed port 22, so that the liquid sewage can smoothly enter the screw extruder 2; The water receiving tray 49 is fixed and penetrates the surface of the separation cylinder 31. The water receiving tray 49 corresponds to the position of the water pipe 42 and is used to draw out the flushing sewage, thereby achieving water content adjustment through the external pipeline.

[0043] Without a water collection tray 49, the rinsing wastewater is directly mixed into the material, and the water content is uncontrollable. However, in this embodiment, the water content can be flexibly adjusted according to the fermentation process requirements.

[0044] The working principle of this invention is as follows: The manure is poured in through the top opening of the feed hopper 32. The manure will first pass through the primary separation grid 33 for preliminary filtration to remove large impurities. After the manure falls through the multi-stage continuous separation mechanism 3 for preliminary separation, it enters the screw press 2 through the feed inlet 22. The screw press can further separate the solid and liquid. The liquid is transported to the fermentation structure 1 through the conveying pipe 21 for anaerobic fermentation. The surface of the conveying pipe 21 is equipped with a conveying pump to transport the separated liquid. This scheme can perform multi-stage separation of manure. When the sewage enters the inner side of the separation cylinder 31, it needs to be separated by the filter plate 37. The solids remain on the upper surface of the filter plate 37, and the liquid falls through the filter plate 37. Then, it is collected by the liquid collection tray 35 and flows downward. The V-shaped baffle 38 is used to isolate the sewage entering to prevent splashing. The drive shaft 36 is controlled by the drive base 310 to rotate slowly, which in turn drives the filter plate 37 to rotate. At this time, the solids separated on the surface of the filter plate 37 are moved out of the range of the V-shaped baffle 38 through the notch 381. Then, the solid sewage is discharged by the inclined scraper 39 and discharged through the discharge guide plate 34. This scheme achieves continuous separation by rotating the filter plate 37, thereby improving the efficiency of solid-liquid separation. Solid-liquid separation occurs when the filter plate 37 rotates through the area of ​​the V-shaped baffle 38. The solid waste is discharged through the discharge guide plate 34 and then enters the area below the water pipe 42. When the drive base 310 is started, the rotation of the rotating shaft 45 is driven by the meshing of the first conical tooth 311 and the second conical tooth 46, which in turn drives the rotating disk 47 to rotate. Since the eccentric block 48 and the rotating disk 47 are in an eccentric state, the swing rod 43 is driven to swing back and forth within a certain angle through the cooperation of the eccentric block 48 and the U-shaped groove 44. At this time, the swing rod 43 drives the water pipe 42 to swing back and forth. The high-pressure water flow is delivered to the inside of the water pipe 42 by the external high-pressure water pump. The clean water is sprayed downward through the nozzle 421 to rinse the filter plate 37 below, preventing the mesh from being blocked and affecting the solid-liquid separation effect. This scheme controls the water pipe 42 to swing back and forth to rinse the mesh on the surface of the filter plate 37 at different angles, thereby improving the rinsing effect. Depending on the subsequent fermentation process, a water collection tray 49 can be installed on the surface of the separation cylinder 31 to draw out the flushed wastewater, thereby adjusting the moisture content of the manure to suit dry or wet fermentation.

[0045] The above description is merely a preferred embodiment of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention. Structures, devices, and operating methods not specifically described or explained in this invention are implemented according to conventional methods in the art unless otherwise specified or limited.

Claims

1. A multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure, comprising a fermentation structure (1) and a screw extruder (2), characterized in that: The fermentation structure (1) includes a base (11), a fermentation tank (12) is fixed on the top of the base (11), the screw extruder (2) is placed on one side of the fermentation structure (1), and a conveying pipe (21) is installed at the liquid outlet end of the screw extruder (2), and the end of the conveying pipe (21) is connected to the fermentation structure (1). The upper surface of the screw extruder (2) is provided with a feed inlet (22). The top of the screw extruder (2) is provided with a multi-stage continuous separation mechanism (3). The multi-stage continuous separation mechanism (3) is used to perform preliminary separation of the feces entering the screw extruder (2). The multi-stage continuous separation mechanism (3) includes a separation cylinder (31). The top of the separation cylinder (31) is provided with a feed hopper (32). The feed hopper (32) is located directly above the feed inlet (22). The end of the feed hopper (32) is provided with a primary separation grid (33). A drive shaft (36) is rotatably mounted inside the separation cylinder (31), and a filter plate (37) is fixed at the bottom of the drive shaft (36). The filter plate (37) is used for intermediate separation of feces and sewage. A flushing mechanism (4) is provided on one side of the separation cylinder (31).

2. The multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure according to claim 1, characterized in that: The separation cylinder (31) is provided with a discharge guide plate (34) on the front side. The discharge guide plate (34) is flush with the upper surface of the filter plate (37). An inclined scraper (39) is fixed inside the separation cylinder (31). The inclined scraper (39) is used to discharge the solid fecal matter on the surface of the filter plate (37) onto the discharge guide plate (34).

3. The multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure according to claim 2, characterized in that: A V-shaped baffle (38) is fixed inside the separator (31). The V-shaped baffle (38) is placed above the filter plate (37). The outlet of the feed hopper (32) is located above the inside of the V-shaped baffle (38).

4. The multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure according to claim 3, characterized in that: The V-shaped baffle (38) has a notch (381) on the side below the discharge guide plate (34), through which the solid fecal matter separated by the filter plate (37) moves out of the range of the V-shaped baffle (38).

5. The multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure according to claim 4, characterized in that: A liquid collection plate (35) is fixed inside the separation cylinder (31). The liquid collection plate (35) is placed below the filter plate (37). A material port (351) is opened at the bottom of the liquid collection plate (35). The material port (351) coincides with the feed port (22).

6. The multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure according to claim 1, characterized in that: The top of the separation cylinder (31) is fixed with a drive base (310), the top of the drive shaft (36) is mounted on the output end of the drive base (310), and the flushing mechanism (4) includes a support base (41) fixed on the upper surface of the separation cylinder (31) and a water pipe (42) rotating inside the separation cylinder (31).

7. The multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure according to claim 6, characterized in that: The water pipe (42) is placed above the filter plate (37). The water pipe (42) and the feed inlet (22) are respectively placed on the left and right sides of the drive shaft (36). Spray nozzles (421) are evenly arranged below the surface of the water pipe (42). Multiple spray nozzles (421) are used to rinse the filter plate (37). The outer end of the water pipe (42) is connected to a high-pressure water pump.

8. The multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure according to claim 7, characterized in that: The inner side of the support base (41) is rotatably connected to a rotating shaft (45). One end of the rotating shaft (45) is provided with a second conical tooth (46) and the other end is provided with a turntable (47). The output end of the drive base (310) is equipped with a first conical tooth (311), and the first conical tooth (311) and the second conical tooth (46) mesh with each other.

9. A multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure according to claim 8, characterized in that: A swing rod (43) is vertically arranged on the outer end of the water pipe (42). A U-shaped groove (44) is opened on the surface of the swing rod (43). An eccentric block (48) is arranged on the end face of the turntable (47). The eccentric block (48) is placed inside the U-shaped groove (44).

10. A multi-stage solid-liquid separation structure for an anaerobic fermentation device for livestock and poultry manure according to claim 7, characterized in that: The rinsing mechanism (4) also includes a water receiving tray (49) fixed and penetrating the surface of the separation cylinder (31). The water receiving tray (49) is placed below the filter plate (37) and corresponds to the position of the water pipe (42). The water receiving tray (49) is used to draw out the rinsing sewage.

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