A device for pretreating cow dung for biogas liquid production

Abstract

The utility model discloses a kind of cow dung pretreatment devices for biogas liquid production applied to excrement treatment equipment field, including shell and the screening unit being set in shell interior, it is rotated by motor drive link wheel, can drive screen drum rotation, dung material is in screen drum interior and is screened with screen drum rotation, by hydraulic telescopic link extension, make movable cover pass through connecting frame and drive scraper synchronous movement in screen drum inboard, it can scrape off the stone, straw and other impurities sediment in screen drum inboard bottom, to realize the separation of dung material and impurities, in addition, by multiple nozzles, it is evenly arranged in screen drum inboard along screen drum axial direction, when dung material is screened by screen drum rotation, nozzle sprays fan-shaped water flow to screen drum interior, spraying surface evenly covers, impact force is high, it can effectively flush, strip and break the straw and other longer plant fibers in dung material, and homogenize cow manure slurry, improve its fluidity, more conducive to microorganism in subsequent anaerobic fermentation process contact and decomposition.

Description

Technical Field

[0001] This utility model relates to the field of manure treatment equipment, and in particular to a cow manure pretreatment device for biogas production. Background Technology

[0002] Bacteria produce methane gas (biogas) through fermentation. Biogas can be collected and utilized as a clean energy source. During the fermentation process, liquid is also produced as a byproduct, which is biogas liquid. The core of turning cow dung into biogas liquid is through anaerobic fermentation. That is, after cow dung is decomposed by microorganisms in a sealed environment to produce biogas, the remaining liquid residue is biogas liquid.

[0003] Existing technology, such as the utility model with Chinese patent authorization announcement number CN221412412U, discloses a raw material processing device for cow dung fermentation biogas slurry. It includes a top circular trough, with a filter plate positioned above it. The filter plate is connected and fixed to the side wall of the trough via inclined supports. A vertically placed fixed shaft is installed at the center of the filter plate, and a coaxial rotating shaft is sleeved around the fixed shaft. The rotating shaft and the fixed shaft are rotatably connected via rolling bearings. A motor driving the rotating shaft is connected to the top of the rotating shaft, and the motor is connected and fixed to the side wall of the filter plate via a connecting frame. A vertically placed scraper is connected to one side of the rotating shaft, positioned above the filter plate and perpendicular to its top surface. A horizontally placed water pipe is installed on one side wall of the scraper, with one end connected to a water inlet pipe and the other end sealed. The axial direction of the water pipe is distributed radially along the filter plate, and multiple nozzles communicating with the inside of the water pipe are installed on it, facing the filter plate. All nozzles are arranged sequentially along the axial direction of the water pipe. This utility model helps to increase the concentration of the washed cow dung slurry.

[0004] However, impurities such as straw mixed in cow dung easily form a scum layer or sediment in the fermentation tank, which not only reduces the effective fermentation volume but also hinders the smooth release of biogas. At the same time, lignin, cellulose, and other components in straw form a dense spatial structure. This natural barrier makes it difficult for microorganisms to effectively decompose organic matter. Therefore, direct fermentation of untreated straw leads to slow decomposition, low gas production rate, and even requires a longer hydraulic retention time. In addition, impurities such as stones mixed in cow dung will aggravate equipment wear, accumulate in the biogas digester, affect operation, and reduce the quality of organic fertilizer. Existing cow dung pretreatment devices are difficult to effectively screen out impurities such as straw and stones mixed in cow dung, which will have an adverse effect on the subsequent fermentation process. Therefore, we propose a cow dung pretreatment device for biogas liquid production to solve the problems mentioned above. Utility Model Content

[0005] The core of this invention lies in using a rotating screening unit to separate impurities from manure, thus solving the problem that existing manure pretreatment devices struggle to effectively separate impurities such as straw and stones mixed in with manure. Simultaneously, the use of fixed fan-shaped nozzles evenly arranged along the axial direction of the screen cylinder ensures uniform coverage of the spray surface, homogenizing the manure slurry and creating a suitable environment for microorganisms.

[0006] To solve the above problems, the present invention adopts the following technical solution.

[0007] A cow manure pretreatment device for biogas slurry production includes a shell and a screening unit disposed inside the shell. One end of the screening unit is connected to a fixed cover, and the other end of the screening unit is connected to a movable cover. The screening unit, the fixed cover, and the movable cover are all coaxially arranged. The fixed cover is fixedly installed inside the shell by a support structure. The screening unit includes a screen cylinder and a first mounting ring and a second mounting ring respectively fixedly connected to both ends of the outer surface of the screen cylinder. The screen cylinder is rotatably connected to the fixed cover and the movable cover through the first mounting ring and the second mounting ring respectively.

[0008] An electric motor is fixedly installed on the top surface inside the housing, and a connecting wheel is fixedly connected to the output end of the electric motor. The outer surface of the second mounting ring is evenly distributed with a toothed structure, and the connecting wheel is meshed with the second mounting ring through the toothed structure. An installation tube is provided inside the housing, and a feed pipe is fixedly connected to one end of the installation tube away from the middle of the screening unit. The feed pipe passes through the fixed cover. A hydraulic telescopic rod is fixedly installed inside the housing, and the telescopic end of the hydraulic telescopic rod is fixedly connected to the movable cover.

[0009] In an exemplary embodiment, the mounting tube is inclined inside the screen cylinder, and one end of the mounting tube near the middle of the screen cylinder is lower than the other end of the mounting tube away from the middle of the screen cylinder. Furthermore, an opening structure is provided on the bottom end face of the mounting tube near the middle of the screen cylinder.

[0010] In an exemplary embodiment, the first mounting ring and the fixed cover are fixedly rotatably connected, and the second mounting ring and the movable cover are detachably rotatably connected. The screen cylinder can rotate around the mounting shaft of the fixed cover and the movable cover.

[0011] In an exemplary embodiment, a bearing structure is mounted on the outer surface of the second mounting ring, and the movable cover is connected to the outside of the bearing structure by an interference fit.

[0012] As another improvement of this application, a scraper is provided inside the screen cylinder. The outer surface of the scraper is fitted to the inner surface of the screen cylinder, and the axial section shape of the scraper relative to the axis of the screen cylinder is arc-shaped. A connecting frame is fixedly connected between the scraper and the movable cover. When the movable cover and the screening unit are in a closed connection state, the scraper is located inside the screen cylinder on the side close to the fixed cover.

[0013] In an exemplary embodiment, the hydraulic telescopic rods are symmetrically distributed on the outside of the screen cylinder, and the hydraulic telescopic rods are coaxially arranged with the screen cylinder and provide support for the movable cover.

[0014] As another improvement of this application, a rinsing unit is also provided inside the screen cylinder. The rinsing unit includes a water pipe fixedly installed inside the screen cylinder, with one end of the water pipe passing through the fixed cover and extending out of the outside of the fixed cover. A nozzle is fixedly connected to the bottom end of the water pipe, and the nozzles are evenly distributed along the axial direction of the screen cylinder on the inner side of the screen cylinder.

[0015] As a further improvement to this application, the nozzle is a fixed fan-shaped nozzle.

[0016] As another improvement of this application, the angle α of the installation axis of the screening unit relative to the horizontal plane is in the range of 3° to 8°.

[0017] Compared with existing technologies, the advantages of this utility model are:

[0018] 1. This solution uses an electric motor to drive the connecting wheel to rotate, which in turn drives the screen cylinder to rotate. The screen cylinder rotates around the mounting shaft of the fixed cover and the movable cover. The manure is inside the screen cylinder and is screened as the screen cylinder rotates. The manure smaller than the screen hole falls through the screen hole and is discharged from the screen cylinder, while stones, larger straw and other impurities move towards the end of the screen cylinder as it rotates.

[0019] Furthermore, the hydraulic telescopic rod extends to move the movable cover away from the screening unit. At the same time, the movable cover drives the scraper to move synchronously inside the screen cylinder through the connecting frame. The scraper can scrape off the stones, straw and other impurities deposited at the bottom of the screen cylinder, thereby achieving the separation of manure from impurities.

[0020] 2. This solution uses an external high-pressure water inlet pipe, and multiple nozzles are evenly arranged along the axial direction of the screen cylinder on the inner side of the screen cylinder. When the screen cylinder rotates and screens the manure, the nozzles spray water into the screen cylinder. Because the nozzles are fixed fan-shaped nozzles, the water jet from the nozzles is fan-shaped, the spray surface is evenly covered, and the impact force is high. This can effectively wash, peel off and break up long plant fibers and any small impurities that may be mixed in the manure, and homogenize the cow manure slurry, improve its fluidity, and make it more conducive to the contact and decomposition of microorganisms in the subsequent anaerobic fermentation process. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the shell in a partially cut-out state according to the first embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the overall structure of the first embodiment of the present invention;

[0023] Figure 3This is a schematic diagram of the cross-sectional connection structure of the screening unit, fixed cover, and movable cover in the first embodiment of this utility model;

[0024] Figure 4 This utility model Figure 3 Enlarged structural diagram at point A in the diagram;

[0025] Figure 5 This is a partial cross-sectional view of the sieving unit and the movable cover in the first embodiment of the present invention in a separated state;

[0026] Figure 6 This utility model Figure 5 Enlarged diagram of point B in the image;

[0027] Figure 7 This is a partial structural diagram of the screening unit and the fixed cover in a cross-sectional state according to the second embodiment of the present invention;

[0028] Figure 8 This utility model Figure 7 Enlarged structural diagram at point C;

[0029] Figure 9 This is a front view cross-sectional structural diagram of the shell in the first embodiment of this utility model.

[0030] Explanation of the labels in the diagram:

[0031] 1. Shell; 2. Screening unit; 201. Screen cylinder; 202. First mounting ring; 203. Second mounting ring; 3. Fixed cover; 4. Movable cover; 5. Motor; 6. Connecting wheel; 7. Feed pipe; 8. Mounting pipe; 9. Scraper; 10. Connecting frame; 11. Hydraulic telescopic rod; 12. Washing unit; 1201. Water pipe; 1202. Nozzle. Detailed Implementation

[0032] The technical solution will now be clearly and completely described with reference to the accompanying drawings in the embodiments of this utility model.

[0033] First implementation method:

[0034] Please see Figure 1 and Figure 2As shown, a cow manure pretreatment device for biogas production includes a shell 1 and a screening unit 2 disposed inside the shell 1. One end of the screening unit 2 is connected to a fixed cover 3, and the other end of the screening unit 2 is connected to a movable cover 4. The screening unit 2, the fixed cover 3, and the movable cover 4 are all coaxially arranged. The fixed cover 3 is fixedly installed inside the shell 1 by a bracket structure. The screening unit 2 includes a screen cylinder 201 and a first mounting ring 202 and a second mounting ring 203 respectively fixedly connected to both ends of the outer surface of the screen cylinder 201. The screen cylinder 201 is rotatably connected to the fixed cover 3 and the movable cover 4 through the first mounting ring 202 and the second mounting ring 203 respectively.

[0035] Specific examples Figure 3 and Figure 4 As shown, the first mounting ring 202 is fixedly rotatably connected to the fixed cover 3, and the second mounting ring 203 is detachably rotatably connected to the movable cover 4. Furthermore, a bearing structure is mounted on the outer surface of the second mounting ring 203, and the movable cover 4 is connected to the outside of this bearing structure via an interference fit. Figure 3 and Figure 5 As shown, a motor 5 is fixedly installed on the inner top surface of the housing 1, and a connecting wheel 6 is fixedly connected to the output end of the motor 5. The motor 5 can be of model YEJ200L-4. At the same time, it is determined whether to install a reducer according to the specific usage requirements. Meanwhile, the outer surface of the second mounting ring 203 has a uniformly distributed tooth structure, and the connecting wheel 6 forms a meshing connection with the second mounting ring 203 through the tooth structure. When the motor 5 drives the connecting wheel 6 to rotate and drives the screen cylinder 201 to rotate through the second mounting ring 203, the screen cylinder 201 rotates around the mounting shaft of the fixed cover 3 and the movable cover 4. The fixed cover 3 and the movable cover 4 respectively seal the two ends of the screen cylinder 201.

[0036] Specific examples Figure 3 and Figure 5 As shown, the housing 1 is provided with an installation tube 8 inside, and the end of the installation tube 8 away from the middle of the screening unit 2 is fixedly connected to a feed tube 7. The feed tube 7 passes through the fixed cover 3. At the same time, the end of the feed tube 7 away from the screening unit 2 extends out of the housing 1 and is connected to a cow manure inlet pipe. An opening structure is provided on the bottom end face of the installation tube 8 near the middle of the screen cylinder 201. When cow manure is introduced into the installation tube 8, it falls into the middle of the screen cylinder 201 through the opening structure. Furthermore, the installation tube 8 is inclined inside the screen cylinder 201, and the end of the installation tube 8 near the middle of the screen cylinder 201 is lower than the end of the installation tube 8 away from the middle of the screen cylinder 201, which can facilitate the manure to slide towards the opening end of the installation tube 8 under the action of gravity.

[0037] Combination Figure 1 and Figure 5As shown, a hydraulic telescopic rod 11 is fixedly installed inside the housing 1, and the telescopic end of the hydraulic telescopic rod 11 is fixedly connected to the movable cover 4. The hydraulic telescopic rod 11 is coaxially arranged with the screen cylinder 201. The hydraulic telescopic rod 11 is symmetrically distributed on the outside of the screen cylinder 201, which plays a role in stabilizing the movable cover 4. When the hydraulic telescopic rod 11 is extended, it can drive the movable cover 4 to move away from the screening unit 2, so that one end of the screen cylinder 201 is opened.

[0038] Specific examples Figure 2 and Figure 9 As shown, the angle α between the installation axis of the screening unit 2 and the horizontal plane is in the range of 3° to 8°. When one end of the screen cylinder 201 is opened, the stones, larger straws and other impurities remaining after screening in the screen cylinder 201 are transported to the end and discharged as the screen cylinder 201 rotates.

[0039] Furthermore, a scraper 9 is provided inside the sieve cylinder 201. The outer surface of the scraper 9 is fitted to the inner surface of the sieve cylinder 201, and the axial cross-sectional shape of the scraper 9 relative to the axial direction of the sieve cylinder 201 is arc-shaped. A connecting frame 10 is fixedly connected between the scraper 9 and the movable cover 4. Figure 5 and Figure 6 As shown, when the movable cover 4 and the screening unit 2 are in a closed connection state, the scraper 9 is located inside the screen cylinder 201 on the side close to the fixed cover 3. When the hydraulic telescopic rod 11 extends and drives the movable cover 4 to move away from the screening unit 2, the movable cover 4 drives the scraper 9 to move synchronously inside the screen cylinder 201 through the connecting frame 10. The scraper 9 can scrape off the stones, straw and other impurities deposited at the bottom of the screen cylinder 201.

[0040] Working principle: When using this cow manure pretreatment device for biogas production, cow manure and manure slurry are first introduced into the installation pipe 8 through the feed pipe 7, specifically as follows: Figure 3 As shown, the installation pipe 8 is inclinedly arranged inside the screen cylinder 201. When manure is introduced into the installation pipe 8, the cow manure slides towards the open end of the installation pipe 8 under the action of gravity, and falls into the middle of the screen cylinder 201 through the opening structure at the bottom of the installation pipe 8. Figure 1 and Figure 3 As shown, the connecting wheel 6 is driven to rotate by the motor 5, which in turn drives the screen cylinder 201 to rotate, causing the screen cylinder 201 to rotate around the mounting shaft of the fixed cover 3 and the movable cover 4. At this time, the fixed cover 3 and the movable cover 4 respectively seal the two ends of the screen cylinder 201. The manure is inside the screen cylinder 201 and is screened as the screen cylinder 201 rotates. The manure smaller than the screen hole falls through the screen hole and is discharged from the screen cylinder 201, while stones, larger straw and other impurities move towards the end of the screen cylinder 201 as the screen cylinder 201 rotates.

[0041] Combination Figure 1 and Figure 2As shown, a collection device is provided at the bottom of the shell 1. The screened manure falls into the collection device. In addition, by extending the hydraulic telescopic rod 11, the movable cover 4 can be moved away from the screening unit 2, so that one end of the screen cylinder 201 is opened. The stones, larger straws and other impurities at the end of the screen cylinder 201 fall off from the end of the screen cylinder 201 under the action of gravity. At the same time, the movable cover 4 drives the scraper 9 to move synchronously inside the screen cylinder 201 through the connecting frame 10. The scraper 9 can scrape off the stones, straws and other impurities deposited at the bottom of the inner side of the screen cylinder 201, thereby realizing the separation of manure and impurities.

[0042] Second implementation method:

[0043] Please see Figure 7 and Figure 8 As shown in the figure, based on the first embodiment, this embodiment further includes a rinsing unit 12 inside the screen cylinder 201. The rinsing unit 12 includes a water pipe 1201 fixedly installed inside the screen cylinder 201. One end of the water pipe 1201 passes through the fixed cover 3 and extends out of the outside of the fixed cover 3. Meanwhile, a nozzle 1202 is fixedly connected to the bottom end of the water pipe 1201. The nozzles 1202 are evenly distributed along the axial direction of the screen cylinder 201 on the inner side of the screen cylinder 201.

[0044] Working principle: When using this cow manure pretreatment device for biogas production, while the screen cylinder 201 rotates and screens the manure, a high-pressure water inlet pipe is connected to the water pipe 1201, causing the nozzles 1202 to spray water into the screen cylinder 201. At the same time, the fixed fan-shaped nozzles 1202 make the water jet from the nozzles 1202 fan-shaped. Multiple nozzles 1202 are evenly arranged along the axial direction of the screen cylinder 201 on the inner side, which can make the spray surface evenly covered, with high impact force. This can effectively wash, peel off and break up long plant fibers such as straw and any small impurities that may be mixed in the manure, and homogenize the cow manure slurry, improve its fluidity, and make it more conducive to microorganisms to contact and decompose it in the subsequent anaerobic fermentation process.

[0045] The above are merely preferred embodiments of this utility model; they encompass all the protection scope of this utility model. Any equivalent substitutions or modifications made by those skilled in the art within the technical scope disclosed in this utility model, based on the technical solution and its improved concept, should be covered within the protection scope of this utility model.

Claims

1. A cow manure pretreatment device for biogas liquid production, comprising a shell (1) and a screening unit (2) disposed inside the shell (1), characterized in that: One end of the screening unit (2) is connected to a fixed cover (3), and the other end of the screening unit (2) is connected to a movable cover (4). The screening unit (2), the fixed cover (3) and the movable cover (4) are all coaxially arranged. The fixed cover (3) is fixedly installed inside the housing (1) by a bracket structure. The screening unit (2) includes a screen cylinder (201) and a first mounting ring (202) and a second mounting ring (203) respectively fixedly connected to both ends of the outer surface of the screen cylinder (201). The screen cylinder (201) is rotatably connected to the fixed cover (3) and the movable cover (4) respectively through the first mounting ring (202) and the second mounting ring (203). The inner top surface of the housing (1) is fixedly installed with an electric motor (5), and the output end of the electric motor (5) is fixedly connected with a connecting wheel (6). The outer surface of the second mounting ring (203) is evenly distributed with a tooth structure, and the connecting wheel (6) is meshed with the second mounting ring (203) through the tooth structure. The housing (1) is provided with an installation tube (8), and the end of the installation tube (8) away from the middle of the screening unit (2) is fixedly connected with a feed pipe (7). The feed pipe (7) passes through the fixed cover (3). The housing (1) is fixedly installed with a hydraulic telescopic rod (11), and the telescopic end of the hydraulic telescopic rod (11) is fixedly connected with the movable cover (4).

2. The cow dung pretreatment device for biogas slurry production according to claim 1, characterized in that: The mounting tube (8) is inclined inside the screen cylinder (201), and the end of the mounting tube (8) near the middle of the screen cylinder (201) is lower than the end of the mounting tube (8) away from the middle of the screen cylinder (201). The bottom end face of the mounting tube (8) near the middle of the screen cylinder (201) has an opening structure.

3. The cow dung pretreatment device for biogas slurry production according to claim 2, characterized in that: The first mounting ring (202) is fixedly rotatably connected to the fixed cover (3), and the second mounting ring (203) is detachably rotatably connected to the movable cover (4). The screen cylinder (201) can rotate around the mounting shaft of the fixed cover (3) and the movable cover (4).

4. The cow dung pretreatment device for biogas slurry production according to claim 3, characterized in that: The outer surface of the second mounting ring (203) is fitted with a bearing structure, and the movable cover (4) is connected to the outside of the bearing structure by an interference fit.

5. A cow dung pretreatment device for biogas slurry production according to claim 4, characterized in that: The screen cylinder (201) is provided with a scraper (9) inside. The outer surface of the scraper (9) is fitted to the inner surface of the screen cylinder (201), and the axial section shape of the scraper (9) relative to the axial direction of the screen cylinder (201) is arc-shaped. A connecting frame (10) is fixedly connected between the scraper (9) and the movable cover (4). When the movable cover (4) and the screening unit (2) are in a closed connection state, the scraper (9) is located inside the screen cylinder (201) on the side close to the fixed cover (3).

6. The cow dung pretreatment device for biogas slurry production according to claim 5, characterized in that: The hydraulic telescopic rods (11) are symmetrically distributed on the outside of the screen cylinder (201), and the hydraulic telescopic rods (11) are coaxially arranged with the screen cylinder (201) and provide support for the movable cover (4).

7. A cow dung pretreatment device for biogas slurry production according to claim 4 or 6, characterized in that: The screen cylinder (201) is also provided with a rinsing unit (12). The rinsing unit (12) includes a water pipe (1201) fixedly installed inside the screen cylinder (201). One end of the water pipe (1201) passes through the fixed cover (3) and extends out of the outside of the fixed cover (3). The bottom end of the water pipe (1201) is fixedly connected to a nozzle (1202), and the nozzle (1202) is evenly distributed along the axial direction of the screen cylinder (201) on the inner side of the screen cylinder (201).

8. A cow dung pretreatment device for biogas slurry production according to claim 7, characterized in that: The nozzle (1202) is a fixed fan-shaped nozzle.

9. A cow dung pretreatment device for biogas slurry production according to claim 8, characterized in that: The angle α between the installation axis of the screening unit (2) and the horizontal plane is in the range of 3°~8°.

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