A high-pressure plate and frame sludge dewatering device and its application method

Abstract

This invention discloses a high-pressure plate and frame sludge dewatering device and its application method. The device includes a base, a limiting frame slidably engaged on the base, a water filtering module slidably engaged on the limiting frame, a pull plate module on the limiting frame, and a water collection module between the base and the limiting frame. High-pressure deep dewatering of the sludge is applied through a pressurized diaphragm, significantly reducing the moisture content of the converted filter cake to meet resource utilization requirements. Simultaneously, the innovative use of filtrate discharge to drive the extension and retraction of the water collection module causes the limiting frame to slide back and forth along a wave-shaped guide groove, generating regular vibrations, solving the filter cake adhesion problem and achieving efficient automatic unloading. The structural linkage design synchronously completes the entire process of dewatering, filtrate discharge, and cake unloading, significantly improving processing efficiency and reducing operating costs, providing reliable equipment support for the full resource utilization of sludge and sewage.

Description

Technical Field

[0001] This invention relates to the field of sludge purification technology, specifically to a high-pressure plate and frame sludge dewatering device and its application method. Background Technology

[0002] High-pressure plate and frame sludge dewatering and purification devices belong to the field of environmental engineering technology and are widely used in municipal sewage treatment plants, industrial wastewater treatment facilities, and large-scale livestock and poultry farms. The core task is to deeply dewater and purify raw sludge or manure with extremely high water content, significantly reducing its volume and weight to form sludge cakes with lower water content and more stable physical properties. This significantly reduces the difficulty, cost, and environmental risks of subsequent disposal such as landfill, incineration, or resource utilization. It is one of the key pieces of equipment for achieving volume and weight reduction in the modern sludge and manure treatment and disposal chain.

[0003] Among existing sludge dewatering technologies, belt filter presses, centrifugal dewatering machines, and ordinary plate and frame filter presses are the most common equipment. Belt filter presses and centrifugal dewatering machines can achieve continuous operation, have a large processing capacity, and are relatively easy to operate. However, when processing certain difficult-to-dewater organic sludge, they often fail to reduce the moisture content of the sludge cake to a sufficiently low level, and they also cause significant damage to the integrity of the solid organic matter, which is not conducive to subsequent resource utilization. Although ordinary plate and frame filter presses have higher pressure and relatively lower moisture content of the sludge cake after dewatering, they have disadvantages such as long single-cycle operation time, low degree of automation, severe cake adhesion leading to difficulty in unloading, and lack of adaptive design for the high fiber characteristics of fecal sludge.

[0004] Traditional mechanical dewatering equipment is limited by the pressure intensity and dewatering principle it applies, making it unable to thoroughly remove the internal bound water between sludge particles. This results in a high residual moisture content in the sludge cake, which is difficult to meet the increasingly stringent sludge cake disposal standards. To obtain sludge cakes with lower moisture content, existing technologies often require higher energy consumption, more chemical conditioning agents, longer dewatering time, or sacrifice in throughput. Furthermore, dried filter cakes are prone to sticking, leading to difficulties in continuous unloading and hindering the efficient and continuous operation of the equipment. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a high-pressure plate and frame sludge dewatering device and its application method.

[0006] The technical solution of the present invention is: a high-pressure plate and frame sludge dewatering device, comprising a base, a limiting frame slidably snapped onto the base, a water filtering module slidably snapped onto the limiting frame, a pull plate module disposed on the limiting frame, and a water collection module disposed between the base and the limiting frame. The bottom of the limiting frame is provided with a roller, and the base is provided with a guide groove that slides and engages with the roller. The guide groove has a bottom with a wavy longitudinal section. The limiting frame has horizontal grooves on both sides inside, and the water filtration module has protrusions on both sides that slide and engage with the horizontal grooves on the corresponding side. The water filtration module includes multiple filter shells that are slidably snapped into the limiting frame, a perforated filter plate disposed inside the filter shell, and a pressure-boosting diaphragm disposed on one side of the perforated filter plate. One end of the limiting frame is provided with a thrust plate that contacts the water filtration module 3, and the other end of the limiting frame is provided with a hydraulic cylinder, and the output end of the hydraulic cylinder is connected to a clamping plate disposed on the outermost filter shell. Each of the filter housings is provided with a mud injection pipe communicating with the internal cavity, a water guide pipe for drainage, and a liquid injection pipe communicating with the inside of the pressurized diaphragm; the base is provided with a feed pump connected to the mud injection pipe through a conduit, and the base is provided with a high-pressure water pump connected to the liquid injection pipe through a conduit. The pull plate module includes a guide rail disposed on the limiting frame, a slide table slidably engaged on the guide rail, an electric push rod disposed on the guide rail and connected to the slide table, and an electric telescopic head disposed on the slide table for pushing the filter housing; the filter housing has stops on both sides that can cooperate with the electric telescopic head. The water collection module includes a support plate rotatably mounted on the end face of the limiting frame via a connecting shaft, a telescopic cavity disposed between the support plate and the base, a piston block disposed inside the telescopic cavity and connected to the telescopic part of the telescopic cavity, and a return spring disposed between the piston block and the inner wall of the telescopic cavity; the telescopic cavity is provided with an inlet pipe and an outlet pipe; a one-way valve is provided inside the inlet pipe, and a time-delay pressure valve is provided inside the outlet pipe.

[0007] Description: Multiple filter housings are clamped together by a hydraulic cylinder. Slurry is injected into the filter housings through a slurry injection pipe. A high-pressure water pump injects liquid into the pressurized diaphragm through a liquid injection pipe to apply pressure and dewater the sludge. Water flows out from the perforated filter plate. The drained filter housing is pulled to the other side by a pull plate module to detach it. The water flowing out of the perforated filter plate flows into the telescopic cavity of the water collection module, pushing the piston block to slide. Through a time-delayed pressure valve and a return spring, the accumulated water is drained and the piston block is pulled back in a reciprocating cycle. This causes the limiting frame to slide on the guide groove. Since the limiting frame is rotatably connected to the support plate and slidably connected to the base, the vibration caused by the movement of the limiting frame in the corrugated guide groove makes it easier for the filter cake to fall.

[0008] Furthermore, the bottom of the limiting frame is provided with a second drive motor, a plurality of horizontally arranged crushing rollers, and a first chain for connecting the output end of the second drive motor to each crushing roller. The outer side of the first chain is provided with a toothed structure, the output end of the second drive motor is provided with a first gear that meshes with the outer surface of the first chain, and each crushing roller is provided with a first sprocket that meshes with the inner ring surface of the first chain.

[0009] Explanation: Multiple crushing rollers are linked by the first chain meshing with the first gear, so that a single motor drives multiple rollers to rotate synchronously, which can efficiently crush fibrous impurities and clumps in manure and sewage, avoid blockage during subsequent dewatering, and reduce energy consumption.

[0010] Furthermore, a pulverizing screen is also provided on the base located at the bottom of the pulverizing roller. The pulverizing screen includes a screen plate provided on the base, a cutting mesh slidably engaged on the screen plate, and an elastic element transversely provided at the connection between the cutting mesh and the screen plate. A second gear is rotatably provided on the base, and the first gear meshes with the second gear. A lever for intermittently moving the cutting mesh is provided on the second gear.

[0011] Explanation: The second gear meshes with the first gear, driving the lever to periodically move the cutting screen. Combined with the deformation and reset of the elastic element, high-frequency vibration is generated, which actively peels off the screen adhering material, completely solving the problem of screen hole blockage caused by high-fiber fecal powder, and ensuring the continuous operating efficiency of the screen disc.

[0012] Furthermore, the elastic element is a spring or a bent shape memory metal sheet.

[0013] Note: The elastic element uses springs or memory metal sheets to provide stable elastic restoring force during vibration, ensuring that the cutting mesh quickly returns to its original position and maintains consistent amplitude. This adapts to the vibration and anti-clogging requirements of manure with varying humidity levels, extending the equipment's lifespan.

[0014] Furthermore, an airbag is provided between the filter housing and the limiting frame, and a backflush pipe is also provided inside the filter housing, which communicates with the cavity outside the perforated filter plate. The airbag is connected to the backflush pipe. A one-way valve is provided on the airbag, and the end of the backflush pipe has multiple air outlets, each of which is equipped with an electrically controlled valve.

[0015] Explanation: When the filter housing is subjected to pressure and vibration, the air bladder is compressed to store energy, and the backflush pipe releases airflow in a directional manner through an electronically controlled valve, automatically cleaning the mud film on the surface of the perforated filter plate, thus solving the problem of reduced dewatering efficiency caused by filter cloth clogging in traditional filter presses.

[0016] Furthermore, both the perforated filter plate and the backflush pipe are provided with filter cloth.

[0017] Note: The perforated filter plate and the backflush pipe are covered with filter cloth, which doubles the interception of sludge particles, avoids micropore clogging and improves the clarity of the filtrate, and can meet the water quality requirements for direct agricultural irrigation of liquid organic fertilizer.

[0018] Furthermore, the surface of the perforated filter plate is provided with multiple rollers spaced longitudinally, and the central shaft of each roller is connected inside the perforated filter plate by a second chain; an impeller is also rotatably provided on one side of the backflush pipe, and a second sprocket that meshes with the second chain is coaxially provided on the impeller, and the second sprocket is meshed with the second chain.

[0019] Explanation: The backflush airflow drives the impeller to rotate, which in turn drives the roller to roll via the second sprocket and the second chain. This mechanically peels off the residual filter cake from the filter cloth, reducing the frequency of chemical cleaning and significantly lowering maintenance costs.

[0020] Furthermore, the pressure boosting diaphragm is made of rubber, and the surface of the pressure boosting diaphragm has an array of intermittently distributed textured surfaces.

[0021] Note: The rubber pressure diaphragm has a textured surface to increase frictional resistance with the sludge, prevent the sludge from slipping and shifting during high-pressure extrusion, ensure uniform transmission of dewatering pressure, and improve the overall dryness consistency of the sludge cake.

[0022] The present invention also provides a method for applying the aforementioned high-pressure plate and frame sludge dewatering device, comprising the following steps: S1, Filter pressing and molding The hydraulic cylinder is controlled to press multiple filter shells, and sewage sludge is injected into the filter shells through the sludge injection pipe; the high-pressure water pump is used to inject liquid into the pressurized diaphragm through the liquid injection pipe, squeezing the sewage sludge, and the water in the sewage sludge is discharged through the perforated filter plate to form a filter cake. S2, Vibration unloading of cake The filter cake formed after extrusion and dehydration remains inside the filter housing; the filtrate discharged from the perforated filter plate flows into the telescopic cavity through the water guide pipe, pushing the piston block to compress the reset spring; the time-delayed pressure valve opens to discharge the filtrate, the reset spring pushes the piston block to reset, and drives the support plate to move the limit frame to slide back and forth along the corrugated guide groove; the hydraulic cylinder retracts to release the clamping, and the pull plate module drives the electric telescopic head to push the stop block, separating the filter housing step by step; the vibration of the limit frame causes the filter cake to fall out of the separated filter housing; S3, Filter cake crushing resource utilization The detached filter cake is crushed and processed into biomass fuel or organic fertilizer raw material; S4. Filtrate resource recovery The filtrate discharged from the water inlet pipe and the outlet pipe of the telescopic cavity is used directly as liquid organic fertilizer for farmland irrigation, or it can be concentrated through membrane treatment to extract and recover nitrogen, phosphorus, and potassium nutrients.

[0023] Description: This application method completes the closed-loop high-value conversion of solid-phase fuel fertilizer and liquid-phase nutrient salt organic fertilizer in a single device through high-pressure diaphragm dehydration, potential energy vibration unloading, directional resource utilization of filter cake, and graded recovery of filtrate. Compared with traditional processes, the resource utilization rate is increased by nearly 50%, and the operating cost is reduced by nearly 35%, which completely solves the two major defects of insufficient dehydration limit and fragmented resource recovery in the background technology.

[0024] Compared with the prior art, the beneficial effects of the present invention are: This invention utilizes a pressurized diaphragm to apply high pressure for deep dewatering of the sludge, significantly reducing the moisture content of the converted filter cake and ensuring it meets the requirements for resource utilization. Simultaneously, it innovatively employs filtrate discharge to drive the telescopic movement of the water collection module, causing the limiting frame to slide back and forth along a wave-shaped guide groove, generating regular vibrations. This synergistic effect during the separation of the filter shell by the pull plate module completely solves the problem of filter cake adhesion, achieving efficient and automatic unloading. This device not only breaks through the efficiency limits of traditional dewatering equipment but also, through its structural linkage design, simultaneously completes the entire process of dewatering, filtrate discharge, and cake unloading, greatly improving processing efficiency and reducing operating costs, providing reliable equipment support for the full-scale resource utilization of sludge and sewage.

[0025] The application method of this invention involves pre-crushing the high-fiber manure filter cake with a crushing roller, achieving efficient solid-liquid separation through high-pressure dehydration via a diaphragm, and ensuring the complete detachment of the high-organic-matter filter cake during the vibration unloading process. This allows the filter cake to be directly converted into organic fertilizer and biochar through composting or carbonization. Simultaneously recovered nutrient-rich filtrate is buffered and its flow rate is regulated by a telescopic cavity, making it safe for use in farmland irrigation or for concentration and salt extraction. This method completely avoids the defects of high solid-phase residue and liquid-phase resource waste in traditional manure sludge resource recovery processes, forming a resource recovery chain of dehydration and volume reduction, solid-phase fuel fertilizer production, and liquid-phase nutrient reuse, thus achieving the harmless treatment and high-value utilization of all components of manure. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the guide groove and roller structure of Embodiment 1 of the present invention; Figure 3 This is a side sectional view of the filter housing in Embodiment 1 of the present invention; Figure 4 This is a schematic diagram of the overall structure of the filter housing in Embodiment 1 of the present invention; Figure 5 This is a front sectional view of the filter housing in Embodiment 1 of the present invention; Figure 6 This is a schematic diagram of the water collection module in Embodiment 1 of the present invention; Figure 7 This is a schematic diagram of the structure of the crushing roller in Embodiment 3 of the present invention; Figure 8This is a schematic diagram of the structure of the pulverizing sieve in Embodiment 3 of the present invention; Figure 9 This is a schematic diagram of the overall structure of Embodiment 4 of the present invention; Figure 10 This is a front sectional view of the filter housing in Embodiment 4 of the present invention; Figure 11 This is a side sectional view of the filter housing in Embodiment 5 of the present invention; Figure 12 This is a front sectional view of the filter housing in Embodiment 5 of the present invention; Among them, 1-base, 11-guide groove, 2-limiting frame, 21-roller, 22-horizontal groove, 23-second drive motor, 231-first gear, 24-crushing roller, 25-first chain, 251-first sprocket, 26-second gear, 27-lever, 3-water filter module, 31-protrusion, 32-filter shell, 321-mud injection pipe, 322-water guide pipe, 323-liquid injection pipe, 324-backflush pipe, 34-perforated filter plate, 35-pressure booster. 36-Thrust plate, 37-Pressure plate, 38-Hydraulic cylinder, 39-Stop block, 4-Pull plate module, 41-Guide rail, 42-Slide table, 43-Electric push rod, 44-Electric telescopic head, 5-Water collection module, 51-Support plate, 52-Telescopic cavity, 53-Piston block, 54-Reset spring, 6-Grinding screen, 61-Screen plate, 62-Cutting mesh, 63-Elastic element, 7-Airbag, 8-Roller, 81-Second chain, 82-Impeller, 83-Second sprocket. Detailed Implementation

[0027] The present invention will now be described in more detail with reference to specific embodiments, so as to better demonstrate the advantages of the present invention.

[0028] Example 1: As Figure 1 The high-pressure plate and frame sludge dewatering device shown includes a base 1, a limiting frame 2 slidably snapped onto the base 1, a water filter module 3 slidably snapped onto the limiting frame 2, a pull plate module 4 set on the limiting frame 2, and a water collection module 5 set between the base 1 and the limiting frame 2. like Figure 2 As shown, the bottom of the limiting frame 2 is provided with a roller 21, and the base 1 is provided with a guide groove 11 that slides and engages with the roller 21. The guide groove 11 has a bottom with a wavy longitudinal section. like Figure 3 , 4 As shown, the limiting frame 2 has horizontal grooves 22 on both sides inside, and the water filter module 3 has protrusions 31 on both sides of its side walls that slide and engage with the horizontal grooves 22 on the corresponding side. like Figure 3 , 4As shown, the water filtration module 3 includes multiple filter shells 32 that are slidably snapped into the limiting frame 2, a perforated filter plate 34 disposed inside the filter shell 32, and a pressure-boosting diaphragm 35 disposed on one side of the perforated filter plate 34. One end of the limiting frame 2 is provided with a thrust plate 36 that contacts the water filtration module 3, and the other end of the limiting frame 2 is provided with a hydraulic cylinder 38. The output end of the hydraulic cylinder 38 is connected to a pressing plate 37 disposed on the outermost filter shell 32. like Figures 3-5 As shown, each of the multiple filter housings 32 is provided with a mud injection pipe 321 communicating with the internal cavity, a water guide pipe 322 for drainage, and a liquid injection pipe 323 communicating with the inside of the pressurizing diaphragm 35; a feed pump 12 connected to the mud injection pipe 321 via a conduit is provided on the base 1, and a high-pressure water pump 13 connected to the liquid injection pipe 323 via a conduit is provided on the base 1; the pressurizing diaphragm 35 is made of rubber, and the surface of the pressurizing diaphragm 35 has an array of intermittently distributed textured surfaces; like Figure 2 As shown, the pull plate module 4 includes a guide rail 41 disposed on the limiting frame 2, a slide table 42 slidably engaged on the guide rail 41, an electric push rod 43 disposed on the guide rail 41 and connected to the slide table 42, and an electric telescopic head 44 disposed on the slide table 42 for pushing the filter housing 32; the filter housing 32 is provided with stops 39 on both sides that can cooperate with the electric telescopic head 44; like Figure 2 , 6 As shown, the water collection module 5 includes a support plate 51 rotatably mounted on the end face of the limiting frame 2 via a connecting shaft, a telescopic cavity 52 disposed between the support plate 51 and the base 1, a piston block 53 disposed inside the telescopic cavity 52 and connected to the telescopic portion of the telescopic cavity 52, and a return spring 54 disposed between the piston block 53 and the inner wall of the telescopic cavity 52; the telescopic cavity 52 is provided with an inlet pipe and an outlet pipe; a one-way valve is provided inside the inlet pipe, and a time-delay pressure valve is provided inside the outlet pipe.

[0029] It should be noted that this embodiment also includes a power supply and a controller. The power supply, controller, hydraulic cylinder 38, high-pressure water pump 13, and time-delay pressure valve are all commercially available products and will not be described in detail here. The hydraulic cylinder 38, high-pressure water pump 13, and time-delay pressure valve are all electrically connected to the power supply and controller respectively. The time-delay pressure valve adopts XAG's FBV intelligent electric valve.

[0030] Example 2: This example is an application method of the high-pressure plate and frame sludge dewatering device described in Example 1, including the following steps: S1, filter press molding. The hydraulic cylinder 38 is controlled to press multiple filter shells 32, and the sewage sludge is injected into the filter shells 32 through the sludge injection pipe 321; the high-pressure water pump 13 injects liquid into the pressure diaphragm 35 through the liquid injection pipe 323, squeezes the sewage sludge, and discharges the water in the sewage sludge through the perforated filter plate 34 to form a filter cake. S2, Vibration unloading of cake The filter cake formed after extrusion and dehydration remains inside the filter shell 32; the filtrate discharged from the perforated filter plate 34 flows into the telescopic cavity 52 through the water guide pipe 322, pushing the piston block 53 to compress the reset spring 54; the time-delayed pressure valve opens to discharge the filtrate, the reset spring 54 pushes the piston block 53 to reset, and drives the support plate 51 to drive the limit frame 2 to slide back and forth along the wave-shaped guide groove 11; the hydraulic cylinder 38 retracts to release the clamping, and the pull plate module 4 drives the electric telescopic head 44 to push the stop block 39, separating the filter shell 32 step by step; the vibration of the limit frame 2 causes the filter cake to fall out of the separated filter shell 32; S3, Filter cake crushing resource utilization The detached filter cake is crushed and processed into biomass fuel or organic fertilizer raw material; S4. Filtrate resource recovery The filtrate discharged from the water outlet pipe of the water guide pipe 322 and the water outlet pipe of the telescopic cavity 52 can be used directly as liquid organic fertilizer for farmland irrigation, or extracted and recovered from nitrogen, phosphorus and potassium nutrients through membrane concentration treatment.

[0031] Example 3: This example differs from Example 1 in that, as Figure 7 , 8 As shown, the bottom of the limiting frame 2 is provided with a second drive motor 23, a plurality of horizontally arranged crushing rollers 24, and a first chain 25 for connecting the output end of the second drive motor 23 to each crushing roller 24. The outer side of the first chain 25 is provided with a toothed structure. The output end of the second drive motor 23 is provided with a first gear 231 that meshes with the outer surface of the first chain 25. Each crushing roller 24 is provided with a first sprocket 251 that meshes with the inner ring surface of the first chain 25. A crushing screen 6 is also provided on the base 1 located at the bottom of the crushing rollers 24. The crushing screen 6 includes a screen disk 61 provided on the base 1, a cutting mesh 62 that is slidably engaged on the screen disk 61, and an elastic member 63 that is horizontally arranged at the connection between the cutting mesh 62 and the screen disk 61. A second gear 26 is rotatably arranged on the base 1. The first gear 231 meshes with the second gear 26. The second gear 26 is provided with a lever 27 for intermittently moving the cutting mesh 62. The elastic member 63 is a spring.

[0032] Example 4: This example differs from Example 1 in that, as Figure 9 , 10As shown, the elastic element 63 is made of a bent shape memory metal sheet; an air bladder 7 is provided between the filter housing 32 and the limiting frame 2, and a backflush pipe 324 communicating with the cavity outside the perforated filter plate 34 is also provided inside the filter housing 32, and the air bladder 7 is connected to the backflush pipe 324; a one-way valve is provided on the air bladder 7, and the end of the backflush pipe 324 has multiple air outlets, each of which is equipped with an electrically controlled valve; filter cloth is provided on both the perforated filter plate 34 and the backflush pipe 324.

[0033] Example 5: This example differs from Example 1 in that, as Figure 11 , 12 As shown, the surface of the perforated filter plate 34 is provided with a plurality of rollers 8 arranged longitudinally at intervals, and the central shaft of each roller 8 is connected inside the perforated filter plate 34 by a second chain 81; an impeller 82 is also rotatably arranged on one side of the backflush pipe 324, and a second sprocket 83 coaxially arranged on the impeller 82 and meshing with the second chain 81, and the second sprocket 83 is meshed with the second chain 81.

Claims

1. A high-pressure plate and frame sludge dewatering device, characterized in that, Includes a base (1), a limiting frame (2) that is slidably snapped onto the base (1), a water filter module (3) that is slidably snapped onto the limiting frame (2), a pull plate module (4) that is set on the limiting frame (2), and a water collection module (5) that is set between the base (1) and the limiting frame (2); The bottom of the limiting frame (2) is provided with a roller (21), and the base (1) is provided with a guide groove (11) that slides and engages with the roller (21). The guide groove (11) has a bottom with a wavy longitudinal section. The limiting frame (2) has horizontal grooves (22) on both sides inside, and the water filter module (3) has protrusions (31) on both sides of its side wall that slide and engage with the horizontal grooves (22) on the corresponding side. The water filtration module (3) includes multiple filter shells (32) that are slidably snapped into the limiting frame (2), a perforated filter plate (34) disposed inside the filter shell (32), and a pressure-boosting diaphragm (35) disposed on one side of the perforated filter plate (34). One end of the limiting frame (2) is provided with a thrust plate (36) that contacts the water filtration module (3), and the other end of the limiting frame (2) is provided with a hydraulic cylinder (38). The output end of the hydraulic cylinder (38) is connected to a pressing plate (37) provided on the outermost filter shell (32). Each of the filter housings (32) is provided with a mud injection pipe (321) communicating with the internal cavity, a water guide pipe (322) for drainage, and a liquid injection pipe (323) communicating with the inside of the pressurized diaphragm (35); the base (1) is provided with a feed pump (12) connected to the mud injection pipe (321) through a conduit, and the base (1) is provided with a high-pressure water pump (13) connected to the liquid injection pipe (323) through a conduit. The pull plate module (4) includes a guide rail (41) disposed on the limiting frame (2), a slide table (42) slidably engaged on the guide rail (41), an electric push rod (43) disposed on the guide rail (41) and connected to the slide table (42), and an electric telescopic head (44) disposed on the slide table (42) for pushing the filter shell (32); the filter shell (32) is provided with stops (39) on both sides that can cooperate with the electric telescopic head (44). The water collection module (5) includes a support plate (51) rotatably mounted on the end face of the limiting frame (2) via a connecting shaft, a telescopic cavity (52) disposed between the support plate (51) and the base (1), a piston block (53) disposed inside the telescopic cavity (52) and connected to the telescopic part of the telescopic cavity (52), and a return spring (54) disposed between the piston block (53) and the inner wall of the telescopic cavity (52); the telescopic cavity (52) is provided with an inlet pipe and an outlet pipe; a one-way valve is provided inside the inlet pipe, and a time-delay pressure valve is provided inside the outlet pipe.

2. The high-pressure plate and frame sludge dewatering device as described in claim 1, characterized in that, The bottom of the limiting frame (2) is provided with a second drive motor (23), a plurality of horizontally arranged crushing rollers (24), and a first chain (25) for connecting the output end of the second drive motor (23) to each crushing roller (24). The outer side of the first chain (25) is provided with a toothed structure. The output end of the second drive motor (23) is provided with a first gear (231) that meshes with the outer surface of the first chain (25). Each crushing roller (24) is provided with a first sprocket (251) that meshes with the inner surface of the first chain (25).

3. The high-pressure plate and frame sludge dewatering device as described in claim 2, characterized in that, A pulverizing screen (6) is also provided on the base (1) at the bottom of the pulverizing roller (24). The pulverizing screen (6) includes a screen plate (61) provided on the base (1), a cutting mesh (62) slidably engaged on the screen plate (61), and an elastic member (63) laterally provided at the connection between the cutting mesh (62) and the screen plate (61). A second gear (26) is rotatably provided on the base (1). The first gear (231) meshes with the second gear (26). A lever (27) for intermittently moving the cutting mesh (62) is provided on the second gear (26).

4. The high-pressure plate and frame sludge dewatering device as described in claim 3, characterized in that, The elastic element (63) is a spring or a bent shape memory metal sheet.

5. The high-pressure plate and frame sludge dewatering device as described in claim 1, characterized in that, An airbag (7) is provided between the filter housing (32) and the limiting frame (2). The filter housing (32) is also provided with a backflush pipe (324) that communicates with the cavity outside the perforated filter plate (34). The airbag (7) is connected to the backflush pipe (324). A one-way valve is provided on the airbag (7). The backflush pipe (324) has multiple air outlets at its end. Each of the multiple air outlets is provided with an electrically controlled valve.

6. The high-pressure plate and frame sludge dewatering device as described in claim 5, characterized in that, Both the perforated filter plate (34) and the backflush pipe (324) are provided with filter cloth.

7. A high-pressure plate and frame sludge dewatering device as described in claim 6, characterized in that, The surface of the perforated filter plate (34) is provided with a plurality of rollers (8) spaced longitudinally, and the central shaft of each roller (8) is connected inside the perforated filter plate (34) by a second chain (81); an impeller (82) is also rotatably provided on one side of the backflush pipe (324), and a second sprocket (83) is coaxially provided on the impeller (82) and meshes with the second chain (81), and the second sprocket (83) is meshed with the second chain (81).

8. The application method of the high-pressure plate and frame sludge dewatering device as described in claims 1 to 7, characterized in that, Includes the following steps: S1, Filter pressing and molding The hydraulic cylinder (38) is controlled to press multiple filter shells (32), and sewage sludge is injected into the filter shells (32) through the sludge injection pipe (321); the high-pressure water pump (13) injects liquid into the pressurized diaphragm (35) through the liquid injection pipe (323), squeezes the sewage sludge, and discharges the water in the sewage sludge through the perforated filter plate (34) to form a filter cake; S2, Vibration unloading of cake The filter cake formed after squeezing and dehydration remains in the filter shell (32); the filtrate discharged from the perforated filter plate (34) flows into the telescopic cavity (52) through the water guide pipe (322), pushing the piston block (53) to compress the reset spring (54); the time-delay pressure valve opens to discharge the filtrate, the reset spring (54) pushes the piston block (53) to reset, and drives the support plate (51) to drive the limit frame (2) to slide back and forth along the wave-shaped guide groove (11); the hydraulic cylinder (38) retracts to release the clamping, and the pull plate module (4) drives the electric telescopic head (44) to push the stop block (39) to separate the filter shell (32) step by step; the vibration of the limit frame (2) causes the filter cake to fall out of the separated filter shell (32); S3, Filter cake crushing resource utilization The detached filter cake is crushed and processed into biomass fuel or organic fertilizer raw material; S4. Filtrate resource recovery The filtrate discharged from the water outlet pipe (322) and the telescopic cavity (52) can be used directly as liquid organic fertilizer for farmland irrigation, or extracted and recovered as nitrogen, phosphorus and potassium nutrients through membrane concentration treatment.

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