A sludge treatment system for organic fertilizer production

Abstract

The present application discloses a kind of sludge treatment systems for organic fertilizer manufacturing, it is related to the field of organic fertilizer manufacturing, the system includes filter pressing device, mixing device and fermentation device communicated sequentially;Fermentation device includes horizontal tank body, the inner wall of tank body is equipped with scraper, tank body inside is equipped with material frame with end cap sliding connection, material frame is equipped with multiple parallel rotating rollers in, rotating roller is equipped with staggered arrangement broken blade, adjacent rotating roller and broken blade form material leakage hole between, material frame is screened by reciprocating movement, and rotating roller rotation realizes crushing.The present application sets up the material frame that integrates screening and crushing in tank body, and makes it vibrate screening and intermittent crushing action, can screen small particle sludge to avoid excessive crushing of sludge, prevent sludge accumulation compact, while broken to intercept large particle agglomerate, guarantee sludge fermentation process oxygen sufficient contact, improve the fermentation efficiency of organic fertilizer.

Description

Technical Field

[0001] This invention relates to the field of organic fertilizer production and sludge resource utilization technology. Specifically, it relates to a sludge treatment system for organic fertilizer manufacturing, and more particularly to an integrated fermentation device that integrates sludge screening, crushing and turning functions. Background Technology

[0002] With increasingly stringent environmental protection requirements, the resource utilization of sewage sludge has become an important development direction. Using municipal sewage sludge, industrial organic sludge, and other waste materials to produce organic fertilizer is a crucial way to achieve resource recycling. Before fermentation, sewage sludge typically needs to be dewatered by pressure filtration, mixed with auxiliary materials for conditioning, and then sent to a fermentation device for aerobic fermentation. During fermentation, microorganisms require sufficient oxygen to decompose organic matter; therefore, maintaining the material loose, porous, and with good air permeability is key to successful fermentation.

[0003] In existing technologies, commonly used fermentation devices include horizontal drum fermenters, whose inner walls are equipped with lifting plates. The rotation of the drum causes the lifting plates to agitate the sludge, increasing the contact between the material and air. However, due to the high viscosity and moisture content of the sludge, it easily clumps together during fermentation, forming large particles. Oxygen cannot penetrate these large particles, creating anaerobic zones, leading to incomplete fermentation, foul odors, and hindering the elimination of pathogens. To address this problem, some existing technologies have attempted to add crushing mechanisms to the fermentation device to break up large sludge pieces. However, practice has shown that excessive crushing turns the sludge into a slurry or fine powder, with particles tightly packed together, filling all gaps and forming a dense structure that prevents air penetration. This causes the pile to rapidly transition from an aerobic to an anaerobic state, actually inhibiting fermentation. Summary of the Invention

[0004] The present invention aims to overcome the shortcomings of the prior art and provide a sludge treatment system for the manufacture of organic fertilizer, so as to solve the technical problems in the prior art that the sludge is prone to agglomeration during fermentation, leading to anaerobic fermentation, and that excessive crushing leads to material caking and obstruction of oxygen diffusion.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A sludge treatment system for organic fertilizer production includes a filter press, a mixing unit, and a fermentation unit. The discharge end of the filter press is connected to the feed end of the mixing unit via a first belt conveyor, and the discharge end of the mixing unit is connected to the fermentation unit via a second belt conveyor. The fermentation unit includes a horizontal tank with lifting plates on its inner wall. The lifting plates rotate with the tank to agitate the sludge. A material frame is located inside the tank and is slidably connected to the end cap of the tank in the horizontal direction. Multiple parallel rotating rollers are arranged inside the material frame, and each roller has multiple uniformly arranged blades along its axial direction. The blades on adjacent rollers are staggered, and a leakage hole for sludge particles to pass through is formed between the adjacent blades and the side of the adjacent roller.

[0006] The tank body is equipped with a vibration component for reciprocating movement of the material frame and an intermittent drive component for intermittently rotating the rotating roller. The material frame screens the sludge at the leakage hole by reciprocating movement, and the rotating roller crushes the sludge.

[0007] Preferably, the vibration assembly includes a second rotating shaft, on which a rotating wheel is fixedly sleeved; the material frame is slidably connected to the end cover of the tank body through two support rods; one end of a rocker arm is eccentrically hinged to the rotating wheel, and the other end of the rocker arm is hinged to the support rod of the material frame; when the rotating wheel rotates, it drives the material frame to reciprocate.

[0008] Preferably, each rotating roller is slidably sleeved with a rotating rod at its end, and adjacent rotating rods are connected by a synchronous belt to achieve synchronous rotation; one end of one rotating rod is fixedly connected to one end of a connecting shaft, and the other end of the connecting shaft is axially slidably sleeved with a fourth sleeve, and an mounting sleeve is fixedly provided on the outside of the fourth sleeve, and an annular first connecting plate is elastically connected to the mounting sleeve. A first rotating shaft is rotatably connected to the end cap. The first rotating shaft is coaxial with the connecting shaft. A second connecting plate is fixedly connected to the first rotating shaft. The second connecting plate is opposite to the first connecting plate. The first connecting plate can be engaged or disengaged from the second connecting plate by axial movement. A third rotating shaft is rotatably connected to the end cover. The third rotating shaft is parallel to the second rotating shaft and perpendicular to the first rotating shaft. A second bevel gear and a third gear are fixedly connected to the third rotating shaft. A second gear is fixedly connected to the second rotating shaft. The second gear and the third gear are connected by a toothed belt. A first bevel gear is fixedly connected to the first rotating shaft, and the first bevel gear meshes with the second bevel gear.

[0009] Preferably, the mounting sleeve is axially slidably connected to an annular movable plate, the first connecting plate is fixed to the movable plate, and the movable plate and the mounting sleeve are connected by a third elastic element.

[0010] Preferably, a functional cylinder is fixed on the end cover, the axis of the functional cylinder is parallel to the axis of the connecting shaft, the movable end of the functional cylinder is fixedly connected to the mounting sleeve, and the functional cylinder is used to push the mounting sleeve to move so as to realize the connection between the first connecting plate and the second connecting plate.

[0011] Preferably, the minimum distance between adjacent rollers is 40-60mm, the spacing between the crushing blades along the roller axis is 40-60mm, and the equivalent aperture of the material leakage hole is 40-60mm.

[0012] Preferably, the minimum distance between adjacent rollers is equal to the spacing between the crushing blades along the roller axis.

[0013] Preferably, a first support rod is fixedly connected to one end of the material frame, and a second support rod is fixedly connected to the other end. Both the first and second support rods extend to the outside of the tank. A connecting plate is provided at the extended end of the first support rod, and a first elastic element is provided between the connecting plate and the tank.

[0014] Preferably, the extended end of the second support rod is provided with a limiting plate, and a second elastic element is provided between the limiting plate and the tank body.

[0015] Preferably, a connecting seat is fixedly provided on the end cover, and all rotating rods are rotatably connected to the connecting seat. The rotating rods are axially slidably connected to the rotating roller through splines.

[0016] The present invention provides a sludge treatment system for organic fertilizer production, the beneficial effects of which are: 1. This system incorporates a material frame with crushing blades and a discharge hole inside a horizontal tank. Combined with a vibrating assembly outside the tank, this material frame reciprocates, forming a sludge treatment structure integrating screening and crushing. On one hand, small sludge particles can fall directly into the bottom of the tank through the discharge hole for fermentation, avoiding over-crushing. On the other hand, large, agglomerated sludge particles are trapped in the material frame and effectively crushed when the rotating roller drives the crushing blades. This structure enables control over the particle size of the sludge entering the tank, reducing the amount of large sludge particles, optimizing the fermentation process path, and improving the contact efficiency between sludge and oxygen, thereby enhancing the fermentation effect and the uniformity of organic fertilizer quality.

[0017] 2. This system utilizes a vibration assembly consisting of a second rotating shaft, a rotating wheel, and a rocker arm, and an intermittent drive assembly consisting of a first rotating shaft, a second connecting plate, a toothed belt, a functional cylinder, and an electronic control unit (timer, controller) to achieve alternating actions of continuous vibratory screening of the material frame and intermittent rotary crushing of the rotating roller. The material frame continuously reciprocates for efficient screening, while the crushing blades only receive power for intermittent rotary crushing when the two connecting plates are engaged. This crushing action primarily crushes large sludge particles, avoiding over-crushing of small sludge particles and preventing the crushed sludge particles from becoming densely packed. It effectively maintains sufficient free space between material particles, ensuring unobstructed oxygen diffusion channels during fermentation and further optimizing the aerobic fermentation environment. Simultaneously, the electronic control unit can flexibly set the vibration and crushing durations according to the sludge characteristics, thereby adjusting the process parameters. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the external structure of the sludge treatment system described in this invention; Figure 2 This is a schematic diagram of the front cross-section of the sludge treatment system described in this invention; Figure 3 This is a top view structural diagram of the sludge treatment system described in this invention; Figure 4 This is a schematic diagram of the radial cross-section of the sludge treatment system described in this invention; Figure 5 This is a schematic diagram of the structure of the material frame in the sludge treatment system of the present invention; Figure 6 This is a schematic diagram of the structure of the front cover of the sludge treatment system described in this invention; Figure 7 This is a schematic diagram of the structure of the drive component of the sludge treatment system described in this invention (when the two connecting plates are separated); Figure 8 This is a schematic diagram of the structure of the drive component of the sludge treatment system described in this invention (when the two connecting plates are combined).

[0019] In the diagram: 1. Base; 2. Tank body; 3. Front cover; 4. Rear cover; 5. Material frame; 6. Rotating rod; 7. First rotating shaft; 8. Second rotating shaft; 9. Third rotating shaft; 10. First gear; 11. First motor; 12. Second motor; 13. Support; 14. Functional cylinder; 15. Rocker arm; 16. First elastic element; 21. First sleeve; 22. Second sleeve; 23. Gear ring; 24. Lifting plate; 31. Feed pipe; 32. Hopper; 33. Third sleeve; 34. Connecting seat; 41. Discharge pipe; 42. Blower; 51. First support rod; 52. Second support rod; 53. Rotary roller; 54. Connecting plate; 521. Limiting plate; 522. Second elastic element; 531. Crushing blade; 532. Material leakage hole; 61. Synchronous belt; 62. Connecting shaft; 63. Fourth sleeve; 64. Mounting sleeve; 65. Movable plate; 66. First connecting plate; 67. Third elastic element; 68. Limiting ring; 631. Guide block; 71. Second connecting plate; 72. First bevel gear; 81. Second gear; 82. Rotating wheel; 811. Toothed belt; 812. Third gear; 91. Second bevel gear. Detailed Implementation

[0020] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] This embodiment provides a sludge treatment system for organic fertilizer production, including a filter press, a mixing device, and a fermentation device. The filter press can be a plate and frame filter press, and the mixing device can be a twin-shaft paddle mixer. The discharge end of the filter press is connected to the feed end of the mixing device via a first belt conveyor, and the discharge end of the mixing device is connected to the fermentation device via a second belt conveyor. Both the first and second belt conveyors are belt conveyors. The sludge is first dewatered by the filter press, then conveyed by the first belt conveyor to the mixing device to mix with auxiliary materials and fermentation agents, and finally conveyed by the second belt conveyor to the fermentation device for aerobic fermentation.

[0022] Reference Figures 1 to 4 The fermentation apparatus includes a base 1 and a horizontal tank 2. Two first sleeves 21 are fixedly mounted on the base 1, and the first sleeves 21 are fitted onto both ends of the tank 2. The tank 2 and the first sleeves 21 are rotatably connected via a rotary bearing, and the two first sleeves 21 provide rotational support for the tank 2. A second sleeve 22 is fixedly fitted between the two ends of the first sleeves 21, and a gear ring 23 is fitted onto the outside of the second sleeve 22. A first motor 11 is fixedly mounted on the base 1. The output end of the first motor 11 is connected to a fifth rotating shaft (not shown in the figure) via a coupling. A first gear 10 is fixedly fitted onto the fifth rotating shaft, and the first gear 10 meshes with the gear ring 23. The first motor 11 drives the fifth rotating shaft and the first gear 10 to rotate, and the first gear 10 drives the gear ring 23 to rotate, thereby realizing the rotation of the tank 2.

[0023] The inner wall of the tank 2 is evenly provided with multiple lifting plates 24 along the circumference. The lifting plates 24 rotate with the tank 2, lifting up and throwing the sludge at the bottom, thereby turning the sludge.

[0024] Furthermore, one end of the tank body 2 is provided with a front end cover 3, and the other end is provided with a rear end cover 4, to form a seal at both ends of the tank body 2. The front end cover 3 and the rear end cover 4 are fixedly connected to the base 1, and the tank body 2 is rotatably connected to the front end cover 3 and the rear end cover 4 respectively. The front end cover 3 is provided with a feed pipe 31 and a hopper 32 for feeding material, and the discharge end of the second belt conveyor extends above the hopper 32; the feed pipe 31 is preferably a spiral feed pipe for feeding sludge into the tank body 2. The rear end cover 4 is provided with a discharge pipe 41, which is preferably a spiral discharge pipe and is located at the lower part of the rear end cover 4, for discharging sludge from the tank body 2. The tank body 2 can be set to a slight inclination to facilitate material discharge.

[0025] Furthermore, a fan 42 is fixedly installed on the rear end cover 4. The fan 42 is used to blow air into the tank 2, and together with the exhaust pipe of the tank, realizes ventilation and oxygen supply inside the tank 2.

[0026] Reference Figures 2 to 5 The tank body 2 has a material frame 5 inside, located at the upper middle position of the tank body 2, and does not interfere with the position of the lifting plate 24. The material frame 5 is slidably connected to the end cap of the tank body 2 in the horizontal direction. Specifically, a first support rod 51 is fixedly connected to one end of the material frame 5, which passes through the front end cap 3 and extends to the outside of the tank body 2. A third sleeve 33 is provided on the front end cap 3, which is used to accommodate the first support rod 51, and the first support rod 51 and the third sleeve 33 are axially slidably sealed together. A second support rod 52 is fixedly connected to the other end of the material frame 5, which passes through the rear end cap 4 and extends to the outside of the tank body 2, and the second support rod 52 and the rear end cap 4 are slidably sealed together through a corresponding sleeve.

[0027] Furthermore, the extended end of the first support rod 51 is connected to a connecting plate 54, and a first elastic element 16 is provided between the connecting plate 54 and the front end cover 3. The extended end of the second support rod 52 is connected to a limiting plate 521, and a second elastic element 522 is provided between the limiting plate 521 and the rear end cover 4. Both the second elastic element 522 and the first elastic element 16 are compression springs, which provide restoring force and buffering for the reciprocating movement of the material frame 5.

[0028] Furthermore, the material frame 5 is equipped with multiple parallel rotating rollers 53, and the two ends of each rotating roller 53 are mounted to the side plates of the material frame 5 via bearings. Each rotating roller 53 has multiple uniformly arranged blade-like crushing cutters 531 along its axial direction. (Refer to...) Figure 5 The crushing blades 531 between two adjacent rotating rollers 53 are staggered in the axial direction, so that the cylindrical surfaces of the adjacent crushing blades 531 and the two adjacent rotating rollers 53 together form an approximately rectangular space, which is the material leakage hole 532 for qualified small particle sludge to pass through.

[0029] To obtain small-particle sludge that meets the particle size requirements for direct feeding into the bottom of the tank 2 for thorough fermentation, the diameter of the discharge hole 532 needs to be appropriately set. In this embodiment, the minimum distance between adjacent rotating rollers 53 is equal to the spacing of the crushing blades 531 along the axial direction of the rotating rollers 53. Specifically, the minimum distance between adjacent rotating rollers 53 is 50mm, and the spacing of the crushing blades 531 along the axial direction of the rotating rollers 53 is also 50mm, thus forming an equivalent aperture of 50mm for the discharge hole 532. This size setting allows small-particle sludge with a particle size less than 50mm to pass smoothly through the discharge hole 532, while avoiding blockage due to an excessively small equivalent aperture or leakage of large-particle sludge due to an excessively large equivalent aperture, thereby achieving effective control over the particle size of the sludge entering the tank.

[0030] Reference Figure 5 The end of the rotating roller 53 extends through the front cover 3 to the outside of the tank body 2. A connecting seat 34 is fixedly installed on the front cover 3, and the connecting seat 34 has multiple connecting holes, the position and number of which correspond one-to-one with the rotating roller 53. A rotating rod 6 is rotatably sleeved within each connecting hole via a bearing. One end of the rotating rod 6 facing the rotating roller 53 has a splined socket. The extended end of the rotating roller 53 has a matching spline, and the extended end of the rotating roller 53 is axially slidably inserted into the splined socket to achieve an axial sliding connection between the rotating roller 53 and the rotating rod 6, thereby adapting to changes in the axial position of the rotating roller 53 when the material frame 5 moves. Adjacent rotating rods 6 are connected by a synchronous belt 61 to achieve synchronous rotation of all rotating rollers 53.

[0031] Reference Figure 6 and Figure 7A bracket 13 is fixedly mounted on the front end cover 3, and a connecting shaft 62 is rotatably connected to the bracket 13. One end of one of the rotating rods 6 is fixedly connected to one end of the connecting shaft 62, and the other end of the connecting shaft 62 is axially slidably sleeved with a fourth sleeve 63. The fourth sleeve 63 is connected to the connecting shaft 62 via a spline or a flat key, so that the connecting shaft 62 can drive the fourth sleeve 63 to rotate, while the fourth sleeve 63 can slide axially along the connecting shaft 62.

[0032] Furthermore, a mounting sleeve 64 is fixedly disposed on the outside of the fourth sleeve 63, and the mounting sleeve 64 is sleeved on the outside of the fourth sleeve 63. The mounting sleeve 64 is provided with an annular groove, and an annular movable plate 65 is disposed inside the groove. The movable plate 65 is slidably connected to the mounting sleeve 64 via a spline. One side of the movable plate 65 is connected to the mounting sleeve 64 via a third elastic element 67, and a first connecting plate 66 is fixedly disposed on the other side of the movable plate 65.

[0033] A first rotating shaft 7 is rotatably connected to the bracket 13 via bearings. The first rotating shaft 7 is coaxially arranged with the connecting shaft 62 and the fourth sleeve 63. An annular second connecting plate 71 is fixedly sleeved on the end of the first rotating shaft 7 facing the material frame 5. The second connecting plate 71 is arranged opposite to the first connecting plate 66. Friction plates or end face teeth can be provided on the opposing surfaces of the first connecting plate 66 and the second connecting plate 71 to realize torque transmission.

[0034] In this embodiment, the third elastic element 67 is a compression spring, which enables the first connecting plate 66 and the second connecting plate 71 to achieve a flexible engagement when they are joined, avoiding mechanical damage caused by hard collisions. Furthermore, a limiting ring 68 is also provided on the connecting shaft 62 to limit the movement of the fourth sleeve 63.

[0035] Reference Figures 6 to 8 The system also includes a vibration assembly and an intermittent drive assembly. The vibration assembly is used to drive the material frame 5 to reciprocate, and it includes a second rotating shaft 8, which is rotatably connected to the bracket 13 of the front end cover 3 via bearings. A rotating wheel 82 is fixedly sleeved on the second rotating shaft 8. One end of a rocker arm 15 is hinged to the rotating wheel 82 at a position off-center from its rotation center (i.e., an eccentric position), and the other end of the rocker arm 15 is hinged to the connecting plate 54 of the material frame 5.

[0036] Furthermore, a second motor 12 is fixedly mounted on the bracket 13. The output end of the second motor 12 is connected to the end of the second rotating shaft 8 via a coupling, for driving the second rotating shaft 8 to rotate. When the second rotating shaft 8 drives the rotating wheel 82 to rotate, the eccentrically hinged rocker arm 15 pushes and pulls the first support rod 51, thereby driving the material frame 5 and the second support rod 52 connected thereto to overcome the elastic force of the first elastic element 16 and the second elastic element 522, and to move axially reciprocatingly, thereby realizing the screening action of sludge at the leakage hole 532.

[0037] The aforementioned intermittent drive assembly is used to drive the rotary roller 53 to rotate intermittently. (Refer to...) Figure 6 and Figure 7 The intermittent drive assembly includes a third rotating shaft 9, which is rotatably connected to the bracket 13 via bearings. The third rotating shaft 9 is parallel to the second rotating shaft 8 and spatially perpendicular to the first rotating shaft 7. A second bevel gear 91 and a third gear 812 are fixedly sleeved on the third rotating shaft 9. A second gear 81 is fixedly sleeved on the second rotating shaft 8, and the second gear 81 and the third gear 812 are connected by an annular toothed belt 811 to achieve synchronous rotation. A first bevel gear 72 is fixedly sleeved on the first rotating shaft 7, and the first bevel gear 72 meshes with the second bevel gear 91 on the third rotating shaft 9. Thus, the rotational power of the second rotating shaft 8 is sequentially transmitted to the first rotating shaft 7 through the second gear 81, the toothed belt 811, the third gear 812, the third rotating shaft 9, the second bevel gear 91, and the first bevel gear 72, causing the second connecting plate 71 on the first rotating shaft 7 to rotate continuously.

[0038] To achieve intermittent engagement between the first connecting plate 66 and the rotating second connecting plate 71, this embodiment includes a control mechanism. (Refer to...) Figures 6 to 8 A functional cylinder 14 is fixedly mounted on the bracket 13. The axis of the functional cylinder 14 is parallel to the axis of the connecting shaft 62. The movable end of the functional cylinder 14 is fixedly connected to the guide block 631. The guide block 631 is slidably connected to the bracket 13, and the mounting sleeve 64 is rotatably connected to the guide block 631. The functional cylinder 14 is used to push the guide block 631 and the mounting sleeve 64 to move, so as to realize the engagement or separation of the first connecting plate 66 and the second connecting plate 71. When the first connecting plate 66 and the second connecting plate 71 are fully engaged, the third elastic element 67 is compressed, providing stable engagement pressure, allowing the first connecting plate 66 to have a certain axial displacement tolerance, ensuring the smoothness and reliability of the engagement.

[0039] To achieve coordinated operation of the continuous vibration of the material frame 5 and the intermittent crushing of the roller 53, this system also includes an electronic control unit. Specifically, the electronic control unit includes a timer and a controller. The signal output terminal of the timer is electrically connected to the first signal input terminal of the controller, and the control signal output terminal of the controller is electrically connected to the drive circuit or solenoid valve of the functional cylinder 14. The timer is used to collect the cumulative running time of the second motor 12 and transmit the time signal to the controller in real time. The controller has preset vibration time thresholds and crushing hold time thresholds.

[0040] When the second motor 12 rotates continuously for a period of time that reaches the vibration time threshold (i.e., the material frame 5 has reciprocated for a preset duration), the controller sends an extension command to the functional cylinder 14. The functional cylinder 14 pushes the mounting sleeve 64 to move closer to the first rotating shaft 7, so that the first connecting plate 66 and the second connecting plate 71 are pressed together, thereby starting the rotation and crushing action of the rotating roller 53.

[0041] When the duration of the engagement between the first connecting plate 66 and the second connecting plate 71 reaches the crushing holding time threshold, the controller sends a retraction command to the functional cylinder 14. The functional cylinder 14 drives the mounting sleeve 64 to move in the opposite direction, causing the first connecting plate 66 to separate from the second connecting plate 71, and the crushing action stops. Afterward, the controller restarts the timing, and once the vibration time threshold is reached again, the crushing action is restarted. This cycle repeats to achieve automated control of the continuous vibrating screening of the material frame 5 and the intermittent crushing of the rotating roller 53.

[0042] In this embodiment, a cover can be installed on the outside of the bracket 13 to isolate the several rotating shafts on the bracket 13 for dust protection. The second motor 12 can be placed outside the cover for heat dissipation.

[0043] The aforementioned electronic control method can flexibly adjust the time ratio of vibration and crushing according to the characteristics of sludge and the fermentation stage, further optimizing the process adaptability.

[0044] The working process of the sludge treatment system described in this embodiment is as follows: Step 1: The sludge first enters the filter press for dewatering, reducing the moisture content from approximately 98% to 75%-80%; Step 2: The dewatered sludge is fed into the mixing device through the first belt conveyor, and straw, sawdust, return materials and other auxiliary materials are added at the same time. The mixture is thoroughly mixed, the moisture content is adjusted to 60%-65%, and the carbon-nitrogen ratio is adjusted to (20-30):1. Step 3: The mixed material is fed into the horizontal tank 2 from the feed pipe 31 of the fermentation device via the second belt conveyor. The first motor 11 drives the gear ring 23 outside the tank 2 to rotate via the first gear 10, causing the tank 2 to rotate at a low speed, while the lifting plates 24 inside continuously agitate the sludge. The blower 42 introduces outside air into the tank 2 to achieve ventilation and oxygen supply to the sludge.

[0045] The second motor 12 drives the second rotating shaft 8 to rotate. The second rotating shaft 8 drives the material frame 5 to perform stable axial reciprocating vibration through the rotating wheel 82 and the rocker arm 15. The lifting plate 24 on the inner wall of the tank 2 lifts up the sludge at the bottom, raises it to a certain height, and then drops it, realizing the overall turning of the material. The sludge falling from the lifting plate 24 falls onto the material frame 5. Small sludge particles (particle size smaller than the size of the leakage hole 532) fall directly back to the bottom of the tank 2 through the leakage hole 532 to continue fermentation. Large sludge particles are trapped above the rotating roller 53.

[0046] Simultaneously, the second rotating shaft 8 drives the first rotating shaft 7 and the second connecting plate 71 to rotate continuously through a transmission chain consisting of the second gear 81, toothed belt 811, third gear 812, third rotating shaft 9, second bevel gear 91, and first bevel gear 72. When the material frame 5 reciprocates for a preset duration, the controller sends an extension command to the functional cylinder 14. The functional cylinder 14 pushes the mounting sleeve 64 to move closer to the first rotating shaft 7. The mounting sleeve 64 drives the fourth sleeve 63 to slide along the connecting shaft 62, so that the first connecting plate 66 is pressed tightly against the rotating second connecting plate 71. The rotational power of the second connecting plate 71 is then transmitted to the rotating roller 53 through the first connecting plate 66, movable plate 65, mounting sleeve 64, fourth sleeve 63, and connecting shaft 62, driving all rotating rollers 53 to rotate synchronously. The crushing blades 531 on the rotating roller 53 rotate accordingly, shearing and crushing the large particles of sludge trapped in the material frame 5, breaking them into small particles that fall through the discharge hole 532.

[0047] When the duration of the engagement between the first connecting plate 66 and the second connecting plate 71 reaches the crushing holding time threshold, the controller sends a retraction command to the functional cylinder 14. The functional cylinder 14 drives the mounting sleeve 64 to move in the opposite direction, causing the first connecting plate 66 to separate from the second connecting plate 71. Power transmission is interrupted, the rotating roller 53 gradually stops rotating, and the crushing action ceases. Afterward, the controller restarts the timing. Once the vibration time threshold is reached again, the crushing action is restarted. This cycle repeats to achieve continuous vibratory screening of the material frame 5 and intermittent crushing by the rotating roller 53.

[0048] Step 4: After full fermentation, the sludge is discharged from the discharge pipe 41 at the tail of the tank 2 and then processed into organic fertilizer through subsequent aging, screening, granulation and other processes.

[0049] The above are merely preferred embodiments 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. A sludge treatment system for organic fertilizer production, comprising a filter press, a mixing device, and a fermentation device, wherein the discharge end of the filter press is connected to the feed end of the mixing device via a first belt conveyor, and the discharge end of the mixing device is connected to the fermentation device via a second belt conveyor; the fermentation device comprises a horizontal tank (2), the inner wall of which is provided with lifting plates (24), the lifting plates (24) being used to rotate with the tank (2) to agitate the sludge, characterized in that, The tank (2) is provided with a material frame (5) inside, which is slidably connected to the end cap of the tank (2) in the horizontal direction; the material frame (5) is provided with a plurality of parallel rotating rollers (53), and each rotating roller (53) is provided with a plurality of sheet-like crushing blades (531) evenly arranged in the axial direction; the crushing blades (531) between two adjacent rotating rollers (53) are staggered, and a leakage hole (532) for sludge particles to pass through is formed between the side of the adjacent crushing blades (531) and the side of the adjacent rotating roller (53). The tank body (2) is provided with a vibration component for reciprocating the material frame (5) and an intermittent drive component for intermittently rotating the roller (53). The material frame (5) screens the sludge at the leakage hole (532) by reciprocating, and the roller (53) crushes the sludge by rotating.

2. The sludge treatment system according to claim 1, characterized in that, The vibration assembly includes a second rotating shaft (8), on which a rotating wheel (82) is fixedly sleeved; the material frame (5) is slidably connected to the end cap of the tank (2) through two support rods; one end of a rocker arm (15) is eccentrically hinged to the rotating wheel (82), and the other end of the rocker arm (15) is hinged to the support rod of the material frame (5); when the rotating wheel (82) rotates, it drives the material frame (5) to reciprocate.

3. The sludge treatment system according to claim 2, characterized in that, Each of the rollers (53) has a rotating rod (6) slidably sleeved at its end, and adjacent rotating rods (6) are connected by a synchronous belt (61) to achieve synchronous rotation; one end of one of the rotating rods (6) is fixedly connected to one end of a connecting shaft (62), and the other end of the connecting shaft (62) is axially slidably sleeved with a fourth sleeve (63), and an mounting sleeve (64) is fixedly provided on the outside of the fourth sleeve (63), and an annular first connecting plate (66) is elastically connected to the mounting sleeve (64). The end cap is rotatably connected to a first rotating shaft (7), which is coaxially arranged with the connecting shaft (62). A second connecting plate (71) is fixedly connected to the first rotating shaft (7), and the second connecting plate (71) is arranged opposite to the first connecting plate (66). The first connecting plate (66) can be joined or separated from the second connecting plate (71) by axial movement. A third rotating shaft (9) is rotatably connected to the end cap. The third rotating shaft (9) is parallel to the second rotating shaft (8) and perpendicular to the first rotating shaft (7). A second bevel gear (91) and a third gear (812) are fixedly connected to the third rotating shaft (9). A second gear (81) is fixedly connected to the second rotating shaft (8). The second gear (81) and the third gear (812) are connected by a toothed belt (811). A first bevel gear (72) is fixedly connected to the first rotating shaft (7), and the first bevel gear (72) meshes with the second bevel gear (91).

4. The sludge treatment system according to claim 3, characterized in that, The mounting sleeve (64) is axially slidably connected to an annular movable plate (65), the first connecting plate (66) is fixed to the movable plate (65), and the movable plate (65) and the mounting sleeve (64) are connected by a third elastic element (67).

5. The sludge treatment system according to claim 4, characterized in that, A functional cylinder (14) is fixedly provided on the end cover. The axis of the functional cylinder (14) is parallel to the axis of the connecting shaft (62). The movable end of the functional cylinder (14) is fixedly connected to the mounting sleeve (64). The functional cylinder (14) is used to push the mounting sleeve (64) to move so as to realize the combination of the first connecting plate (66) and the second connecting plate (71).

6. The sludge treatment system according to claim 1, characterized in that, The minimum distance between adjacent rotating rollers (53) is 40-60mm, the spacing of the crushing blades (531) along the axial direction of the rotating rollers (53) is 40-60mm, and the equivalent aperture of the material leakage hole (532) is 40-60mm.

7. The sludge treatment system according to claim 6, characterized in that, The minimum distance between adjacent rollers (53) is equal to the spacing of the crushing blades (531) along the axial direction of the rollers (53).

8. The sludge treatment system according to claim 2, characterized in that, One end of the material frame (5) is fixedly connected to a first support rod (51), and the other end is fixedly connected to a second support rod (52). Both the first support rod (51) and the second support rod (52) extend to the outside of the tank body (2). The extended end of the first support rod (51) is provided with a connecting plate (54), and a first elastic element (16) is provided between the connecting plate (54) and the tank body (2).

9. The sludge treatment system according to claim 8, characterized in that, The extended end of the second support rod (52) is provided with a limiting plate (521), and a second elastic element (522) is provided between the limiting plate (521) and the tank (2).

10. The sludge treatment system according to claim 3, characterized in that, A connecting seat (34) is fixedly provided on the end cover, and all the rotating rods (6) are rotatably connected to the connecting seat (34). The rotating rods (6) are axially slidably connected to the rotating roller (53) through splines.

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