An adaptive multilayer pressure filtration system and method

Abstract

An adaptive multi-layer filter press system and method are disclosed. The system includes a filter press device and a folding device. The filter press device includes an upper track mechanism, a lower track mechanism, and a pressure actuator. A filter press zone is formed between the upper and lower track mechanisms, and the thickness of the filter press zone decreases along the material's travel direction. The upper track mechanism includes an upper pressure plate for pressing down the filter press zone, and the lower track mechanism includes a lower pressure plate for supporting the filter press zone. The output end of the pressure actuator is connected to the upper pressure plate and applies pressure to it. The upper pressure plate can move up and down with the output end of the pressure actuator. The folding device is used to fold the filter belt containing the material into multiple layers. This method employs the aforementioned system. This invention folds sludge into multiple layers before it enters the filter press zone for filtration. Through the cooperation of the pressure actuator and the upper pressure plate, jamming can be avoided, allowing the multiple layers of material to pass smoothly through the filter press zone for dewatering. This achieves thin-layer, efficient, and continuous deep dewatering, belonging to the field of dewatering technology.

Description

Technical Field

[0001] This invention relates to the field of dehydration technology, and more specifically to an adaptive multilayer pressure filtration system and method. Background Technology

[0002] With rapid industrial development, environmental problems inevitably arise that require attention. While water treatment technology has matured and water treatment is now more reliable, the sludge produced after water treatment contains microorganisms, pathogens, heavy metals, and other substances, which has always been a thorny issue in the industry. Statistics show that sludge dewatering and volume reduction has become a major challenge in environmental governance. Currently, sludge disposal in the industry mainly relies on mechanical dewatering combined with drying, reducing the volume of sludge for resource utilization such as incineration, building material production, and composting. In the current development of mechanical dewatering technology, plate and frame dewatering machines and belt dewatering machines are the main types, with plate and frame dewatering machines having the largest market share. Their working principle involves using a hydraulic system to press the filter plates together, creating pressure on the filter cloth, and then separating the liquid from the solid particles through pressure difference. This process mainly involves degassing, packing, compression, filtration, and dewatering. With the assistance of chemicals, plate and frame dewatering machines can typically reduce the moisture content of sludge to about 60%-70%, and produce a thick sludge cake. However, this dewatering method has drawbacks: it involves intermittent production and is difficult to automate. Belt dewatering machines primarily use gravity dewatering, with the filter cloth wound into a wedge-shaped zone that presses the cloth against rollers for dewatering. Dewatering mainly relies on the shear force between the filter cloth and the rollers, making it difficult to achieve deep dewatering of the sludge; the moisture content is typically around 80%. Its advantages include automatic feeding and unloading and a high degree of automation. However, its disadvantage lies in the discontinuous stress process on the sludge, failing to create a continuous pressure-holding process, thus hindering the removal of more water from the sludge.

[0003] Therefore, in the mechanical dewatering of sludge, meeting conditions such as high pressure, continuous pressure, and thin-layering is key to removing more water from the sludge, but there is currently no dewatering equipment that can meet these conditions. Summary of the Invention

[0004] In view of the technical problems existing in the prior art, the purpose of this invention is to provide an adaptive multilayer filter press system and method, which can achieve thin-layer and continuous sludge dewatering through stacked continuous filter press.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an adaptive multi-layer filter press system, comprising a filter press device and a folding device. The filter press device includes an upper track mechanism, a lower track mechanism, and a pressure actuator. A filter press zone is formed between the upper track mechanism and the lower track mechanism, and the thickness of the filter press zone decreases along the material's travel direction. The upper track mechanism includes an upper pressure plate for pressing down the filter press zone, and the lower track mechanism includes a lower pressure plate for supporting the filter press zone. The output end of the pressure actuator is connected to the upper pressure plate and applies pressure to the upper pressure plate. The upper pressure plate can move up and down with the output end of the pressure actuator. The folding device is used to fold the filter belt containing the material into multiple layers of material, which are then fed into the filter press device for dewatering.

[0006] With this structure, the sludge is folded into multiple layers before entering the filter press zone for deep dewatering and then pulled apart. This allows for the thinning of the sludge layers, achieving deep dewatering. Furthermore, through the cooperation of the pressure actuator and the upper pressure plate, even if the folded material is thick, jamming can be avoided, allowing the multiple layers of material to pass smoothly through the filter press zone for dewatering, thus achieving efficient and continuous deep dewatering.

[0007] As a preferred embodiment, the thickness of the filter press zone decreases linearly along the direction of material travel, and an angle of 0-30° is formed between the upper and lower surfaces of the filter press zone.

[0008] As a preferred embodiment, the filter press equipment also includes a filter press frame, with both the upper and lower track mechanisms installed in the filter press frame. The pressure actuation element is a hydraulic device, including two hydraulic cylinder groups. The two hydraulic cylinder groups are arranged back and forth along the material's travel direction. Each hydraulic cylinder group includes a hydraulic cylinder, and the output end of the hydraulic cylinder is connected to the upper pressure plate via bolts. The base of the hydraulic cylinder is fixedly connected to the filter press frame, and the lower pressure plate is fixedly connected to the filter press frame.

[0009] As a preferred embodiment, the folding device includes a folding frame, a swing cylinder, a chain drive mechanism, and a mounting base;

[0010] The mounting base is located below the folding frame, which is connected to the mounting base via a buffer spring. The swing cylinder is slidably mounted on the folding frame. A chain drive mechanism connects to the swing cylinder and drives it to move back and forth. A folding assembly is connected to the swing cylinder, which drives it to swing back and forth. The folding assembly includes a front pusher plate and a rear pusher plate that are positioned opposite each other. The filter belt containing the material passes between the front pusher plate and the rear pusher plate. The folding assembly folds the filter belt as the swing cylinder moves back and forth.

[0011] As a preferred embodiment, the folding equipment also includes two symmetrically arranged clamping components, which are rotatably connected to the folding frame. The lower end of the clamping components is used to press down the stacked multi-layered materials. A push rod is connected to the swing cylinder, which moves back and forth between the front and rear stations. When the swing cylinder moves to the front or rear station, the push rod presses against the upper part of the corresponding clamping component, causing the lower end of the clamping component to tilt up.

[0012] As a preferred embodiment, a pre-dewatering device is also included, which comprises multiple pre-compression rollers arranged alternately in the front-to-back direction, so that the filter belt containing the material passes around the multiple pre-compression rollers in a serpentine manner.

[0013] As a preferred embodiment, the device also includes a discharge device, which includes a discharge roller assembly that can move back and forth. The discharge roller assembly includes two discharge rollers, and the filter belt wrapped with material passes between the two discharge rollers. The discharge roller assembly drives the filter belt to move in the opposite direction of the folding direction, thereby pulling the multi-layer material apart layer by layer and restoring it into a belt shape.

[0014] As a preferred embodiment, both the upper track mechanism and the lower track mechanism include a first sprocket, a second sprocket, a track, a support net, and a tensioning mechanism. The track is connected end to end and surrounds the first sprocket and the second sprocket in a racetrack shape. The first sprocket and the second sprocket drive the track to move. The support net is surrounded on the outside of the track and is tensioned by the tensioning mechanism.

[0015] The rear end of the support net of the lower track mechanism is located below the folding device, and the front end of the support net of the lower track mechanism is connected to the discharge equipment.

[0016] An adaptive multilayer pressure filtration method, employing the aforementioned adaptive multilayer pressure filtration system, includes the following steps.

[0017] S1, Fabric: Distribute the material onto the filter belt and feed the filter belt wrapped with the material into the pre-compression equipment;

[0018] S2, Pre-compression dewatering: The filter belt wrapped with the material is pre-compressed and dewatered to form pre-dewatered material;

[0019] S3, Folding: Pre-dehydrated material enters the folding equipment and is folded into multiple layers of material;

[0020] S4, Filtration: Multi-layer material enters the filtration zone of the filtration equipment for dewatering. As the multi-layer material moves forward, the pressure on the multi-layer material increases. When the pressure reaches the preset pressure value, the output end of the pressure actuator rises with the upper pressure plate, allowing the multi-layer material to pass through the filtration zone.

[0021] S5, Unloading: After the multi-layer material passes through the filter press zone, the multi-layer material is pulled apart and restored to a strip-shaped dewatered material. Then the material on the filter belt is scraped off, and the filter belt is returned to the material spreading equipment for spreading.

[0022] As a preferred option, in step S4, after the multi-layer material enters the filter pressing zone of the filter press, it stops moving forward to remove some of the free water before continuing to move forward.

[0023] In summary, the present invention has the following advantages:

[0024] (1) By combining the folding equipment with the tracked filter press, the multi-layer material is dewatered under the combined action of the track mechanism and the pressure actuator, achieving deep dewatering and thin-layer dewatering, while avoiding machine jamming and achieving efficient and continuous production.

[0025] (2) The material is pre-formed after being pre-pressed and then folded, which can ensure the uniformity of material distribution, make the thickness of the folded material uniform, and improve the dehydration effect.

[0026] (3) The filter belt passes through the pre-dewatering equipment, folding equipment, filter press equipment, discharge equipment and unloading equipment in sequence and then returns to the pre-pressing equipment, which can realize the automation of the entire dewatering process and reduce labor costs. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of an adaptive multilayer pressure filtration system.

[0028] Figure 2 This is a 3D view of the folding device.

[0029] Figure 3 This is the front view of the folding device.

[0030] Figure 4 This is a cross-sectional view of the folding device.

[0031] Figure 5 This is a schematic diagram of the structure of a pressure actuator.

[0032] Figure 6 for Figure 5 Internal working principle diagram of area A in the middle.

[0033] Among them, 1 is the pre-dewatering equipment, 2 is the folding equipment, 3 is the filter press equipment, 4 is the discharge equipment, 5 is the filter belt, 6 is the tension roller, 7 is the support screen, and 8 is the scraping equipment.

[0034] 201 is a buffer spring, 202 is a folding frame, 203 is a linear slide rail, 204 is a swing cylinder, 205 is a slide table, 206 is a chain drive mechanism, 207 is a push rod, 208 is a folding assembly, and 209 is a clamping component.

[0035] 301 is the upper pressure plate, 302 is the hydraulic cylinder, 303 is the filter press frame, 304 is the hydraulic pump, 305 is the oil cylinder, 306 is the overflow valve, and 307 is the return oil branch. Detailed Implementation

[0036] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0039] like Figure 1 As shown, an adaptive multi-layer filter press system includes a filter press device and a folding device. The filter press device includes an upper track mechanism, a lower track mechanism, and a pressure actuator. A filter press zone is formed between the upper and lower track mechanisms, and the thickness of the filter press zone decreases along the material's travel direction. The upper track mechanism includes an upper pressure plate for pressing down the filter press zone, and the lower track mechanism includes a lower pressure plate for supporting the filter press zone. The output end of the pressure actuator is connected to the upper pressure plate and applies pressure to the upper pressure plate. The upper pressure plate can move up and down with the output end of the pressure actuator. The folding device is used to fold the filter belt containing the material into multiple layers of material, which are then fed into the filter press device for dewatering.

[0040] The upper and lower track mechanisms can be adopted from existing tracked filter press equipment. In other words, the filter press equipment in this embodiment can be obtained by adding pressure actuators to existing tracked filter press equipment. The pressure actuators and folding devices can be existing products. The pressure actuators can be hydraulic devices or voltage cylinders with adjustable output pressure, etc.

[0041] In use, the folding device can fold the filter belt containing the material (sludge) into multiple layers of material. The multiple layers of material are dewatered in the filter press. Due to the presence of the pressure actuator, the upper platen can move up and down according to the pressure on the material. This not only ensures continuous dewatering of the material under high pressure, but also ensures that the material can be smoothly transported along the narrowing filter press zone, avoiding jamming.

[0042] In some embodiments, the thickness of the filter press zone decreases linearly along the material's travel direction, and an angle of 0-30° is formed between the upper and lower surfaces of the filter press zone. The angle and thickness can be determined based on the folding thickness of the material and the characteristics of the material itself.

[0043] In some embodiments, the filter press equipment further includes a filter press frame, with both the upper and lower track mechanisms installed in the filter press frame. The pressure actuation element is a hydraulic device, including two hydraulic cylinder groups. The two hydraulic cylinder groups are arranged back and forth along the material's travel direction. Each hydraulic cylinder group includes a hydraulic cylinder. The output end of the hydraulic cylinder is connected to the upper pressure plate by bolts. The base of the hydraulic cylinder is fixedly connected to the filter press frame, and the lower pressure plate is fixedly connected to the filter press frame.

[0044] The output ends of the two hydraulic cylinder groups are respectively connected to the feed end and discharge end of the upper pressure plate, and the upper pressure plate can be adjusted in height and move up and down according to the pressure actuator. Each set of hydraulic cylinders includes two hydraulic cylinders, for a total of four hydraulic cylinders, and their output ends are respectively connected to the four corners of the upper pressure plate.

[0045] Before the filter press equipment starts working, the angle of the upper pressure plate can be finely adjusted using bolts. During operation, the two hydraulic cylinder groups can move up and down synchronously, driving the upper pressure plate to steadily rise and fall to adjust the pressure.

[0046] In some embodiments, such as Figure 2-4 As shown, the folding equipment includes a folding frame, a swing cylinder, a chain drive mechanism, and a mounting base. The mounting base is located below the folding frame, which is connected to the mounting base via a buffer spring. The swing cylinder is slidably mounted on the folding frame. The chain drive mechanism connects to the swing cylinder and drives it to move back and forth. A folding assembly is connected to the swing cylinder, which drives it to swing back and forth. The folding assembly includes a front pusher plate and a rear pusher plate that are positioned opposite each other. The filter belt containing the material passes between the front pusher plate and the rear pusher plate. The folding assembly folds the filter belt by moving back and forth with the swing cylinder.

[0047] The mounting base is fixedly connected to the filter press frame. A mounting rod is installed above the folding frame, and a buffer spring is installed between the mounting rod and the folding mechanism. The ends of both the front and rear push cloth plates are bent. The swing cylinder can be an existing product; its output end is connected to the folding assembly and drives it to swing back and forth. A linear slide rail in the front-to-back direction is installed on the folding mechanism, and a slide table is slidably mounted on the linear slide rail. The swing cylinder is mounted on the slide table.

[0048] In some embodiments, the folding device further includes two symmetrically arranged clamping members, which are rotatably connected to the folding frame. The lower end of the clamping members is used to press down the stacked multi-layered material. A push rod is connected to the swing cylinder, which reciprocates between the front and rear stations. When the swing cylinder moves to the front or rear station, the push rod presses down on the upper part of the corresponding clamping member, causing the lower end of the clamping member to tilt up. After the push rod moves away, the clamping member returns to its original position, and its lower end presses down on the newly stacked filter belt. At this time, the swing cylinder moves in the opposite direction to continue stacking.

[0049] The clamping components are L-shaped, with their inner sides facing each other. The middle of the clamping components is rotatably connected to the folding frame. A helical spring is installed on the folding mechanism, with one end of the helical spring pressing against the outer side of the upper part of the clamping component, so that the clamping component can quickly return to its vertical position when the push rod is removed.

[0050] In some embodiments, a pre-dewatering device is also included, which includes a plurality of pre-compression rollers arranged alternately in the front-to-back direction, such that the filter belt containing the material serpentinely wraps around the plurality of pre-compression rollers.

[0051] The pre-dewatering equipment also includes a tensioning roller, which tensions the filter belt so that the pre-pressing roller and the filter belt are wrapped with a certain shear force, so that the filter belt completes pre-dewatering as it travels along the pre-pressing roller. The material (sludge) on the filter belt is spread out smoothly to both sides of the filter belt to obtain a single-layer strip-shaped mud cake with uniform thickness.

[0052] In some embodiments, a discharge device is also included, which includes a discharge roller assembly that can move back and forth. The discharge roller assembly includes two discharge rollers, and the filter belt wrapped with material passes between the two discharge rollers. The discharge roller assembly drives the filter belt to move in the opposite direction of the folding direction, thereby pulling the multi-layer material apart layer by layer and restoring it into a belt shape.

[0053] In some embodiments, the adaptive multilayer filter press system further includes a scraping device. After the multilayer material is pulled apart layer by layer during dewatering, the upper and lower filter belts containing the material are separated. The scraping device scrapes the material off the filter belts with a scraper blade. The scraping device can be an existing product.

[0054] In some embodiments, both the upper track mechanism and the lower track mechanism include a first sprocket, a second sprocket, a track, a support net, and a tensioning mechanism. The track is connected end-to-end and surrounds the first and second sprockets in a racetrack shape. The first and second sprockets drive the track movement. The support net surrounds the outside of the track and is tensioned by the tensioning mechanism. The rear end of the support net of the lower track mechanism is located below the folding device, and the front end of the support net of the lower track mechanism is connected to the discharge device. The tensioning mechanism can be an existing product.

[0055] An adaptive multilayer pressure filtration method, employing the aforementioned adaptive multilayer pressure filtration system, includes the following steps.

[0056] S1, Fabric: Distribute the material onto the filter belt and feed the filter belt wrapped with the material into the pre-compression equipment;

[0057] S2, Pre-compression dewatering: The filter belt wrapped with the material is pre-compressed and dewatered to form pre-dewatered material;

[0058] S3, Folding: Pre-dehydrated material enters the folding equipment and is folded into multiple layers of material;

[0059] S4, Filtration: Multi-layer material enters the filtration zone of the filtration equipment for dewatering. As the multi-layer material moves forward, the pressure on the multi-layer material increases. When the pressure reaches the preset pressure value, the output end of the pressure actuator rises with the upper pressure plate, allowing the multi-layer material to pass through the filtration zone.

[0060] S5, Unloading: After the multi-layer material passes through the filter press zone, the multi-layer material is pulled apart and restored to a strip-shaped dewatered material. Then the material on the filter belt is scraped off, and the filter belt is returned to the material spreading equipment for spreading.

[0061] In step S4, after the multi-layer material enters the filter pressing zone of the filter press equipment, it stops moving to remove some free water before continuing. The stopping time is used for pre-pressing or high-pressure dewatering of the multi-layer material entering the filter press system, while material not yet entering the system waits in the waiting area. The folding time in step S3 is consistent with the stopping time in step S4 to allow sufficient time for multi-layer material distribution.

[0062] In some embodiments, such as Figures 5-6 As shown, the hydraulic device also includes a hydraulic pump, a relief valve, and a cylinder. The cylinder stores the working fluid and is a single-chamber hydraulic cylinder. The cylinder is connected to the oil chamber via a main pipeline. The hydraulic pump is located on the main pipeline and pumps the working fluid (oil) into the oil chamber. A return oil branch is connected to the main pipeline between the hydraulic pump and the cylinder, and the relief valve is located on the return oil branch. The relief valve can be an existing adjustable opening pressure relief valve, and the return oil branch is connected to the cylinder.

[0063] During operation, the hydraulic pump continuously supplies oil to meet the dynamic adjustment requirements of the system. Before operation, the angle of the upper pressure plate and its initial position are adjusted based on the estimated material feed height. The following working states may occur during operation:

[0064] When the material feed height is lower than the preset feed height, the upper pressure plate is subjected to less force, the hydraulic actuator (hydraulic cylinder) is under less pressure, and the oil pressure in the system is lower than the preset pressure value. At this time, the relief valve is closed, the oil flows to the hydraulic cylinder, the output end of the hydraulic cylinder pushes out, and the cylinder works to move the upper pressure plate downward until it is adjusted to above the preset pressure value, and the relief valve opens.

[0065] When the material feed height increases compared to the preset feed height, the upper pressure plate experiences greater force, the hydraulic actuator (hydraulic cylinder) experiences increased pressure, and the oil pressure in the system exceeds the preset pressure value. At this time, the relief valve is in the open state, and the oil flows back to the hydraulic cylinder through the relief valve. Simultaneously, the hydraulic cylinder retracts, and the height of the upper pressure plate increases until it is adjusted to below the preset pressure value, at which point the relief valve closes.

[0066] The ideal working state of the entire adaptive filter press is when the oil pressure in the system is equal to the preset pressure value. When it is higher or lower than the preset pressure value, the above two processes are repeatedly executed.

[0067] In some embodiments, the pressure actuator may also be a pneumatic or electric cylinder, which is mainly used to apply pressure to the upper pressure plate, forcing the material to filter out water under high pressure. By setting an initial pressure, the output pressure of the pressure actuator is kept constant during operation, thereby keeping the contact pressure between the upper pressure plate connected to the pressure actuator and the material assembly constant, but the height of the upper pressure plate will change with the height of the material.

[0068] The above embodiments are preferred embodiments of the invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. An adaptive multi-layer filter-press system, characterized by: The filter press device comprises an upper track mechanism, a lower track mechanism and a pressure executing element, a pressure filtration zone is formed between the upper track mechanism and the lower track mechanism, and the thickness of the pressure filtration zone decreases along the direction of material movement; The upper track mechanism comprises an upper pressing plate for pressing the pressure filtration zone, the lower track mechanism comprises a lower pressing plate for supporting the pressure filtration zone, the output end of the pressure executing element is connected to the upper pressing plate and applies pressure to the upper pressing plate, and the upper pressing plate can move up and down with the output end of the pressure executing element; The folding device is used for folding the filter belt wrapped with material into multi-layer material, and the multi-layer material is sent into the filter press device for dehydration; The folding device comprises a folding frame, a swing cylinder, a chain transmission mechanism and a mounting base; The mounting base is located below the folding frame, the folding frame is connected to the mounting base through a buffer spring, the swing cylinder is slidably mounted on the folding frame, and the chain transmission mechanism is connected to the swing cylinder and drives the swing cylinder to move back and forth; The swing cylinder is connected to a folding assembly, the swing cylinder drives the folding assembly to swing back and forth, the folding assembly comprises a front pushing plate and a rear pushing plate arranged oppositely, the filter belt wrapped with material passes between the front pushing plate and the rear pushing plate, and the folding assembly moves back and forth with the swing cylinder to fold the filter belt; The folding device further comprises two symmetrical pressing members arranged in front of and behind each other, the pressing members are rotatably connected to the folding frame, and the lower ends of the pressing members are used for pressing the stacked multi-layer material; A top rod is connected to the swing cylinder, the swing cylinder moves back and forth between a front end station and a rear end station, when the swing cylinder moves to the front end station or the rear end station, the top rod abuts against the upper part of the corresponding pressing member, and the lower end of the pressing member is lifted up.

2. An adaptive multi-layer pressure filtration system according to claim 1, characterized in that: The thickness of the pressure filtration zone decreases linearly along the direction of material movement, and an included angle of 0-30° is formed between the upper end surface and the lower end surface of the pressure filtration zone.

3. An adaptive multi-layer pressure filtration system according to claim 1, wherein: The filter press device further comprises a filter frame, the upper track mechanism and the lower track mechanism are both mounted in the filter frame, the pressure executing element is a hydraulic device, the hydraulic device comprises two hydraulic cylinder groups, the two hydraulic cylinder groups are arranged in front of and behind each other along the direction of material movement, each hydraulic cylinder group comprises a hydraulic cylinder, the output end of the hydraulic cylinder is connected to the upper pressing plate through a bolt, the base of the hydraulic cylinder is fixedly connected to the filter frame, and the lower pressing plate is fixedly connected to the filter frame.

4. An adaptive multi-layer pressure filtration system according to claim 1, wherein: The filter press device further comprises a pre-dehydration device, the pre-dehydration device comprises a plurality of pre-pressing rollers, the plurality of pre-pressing rollers are arranged in a staggered manner in the front-rear direction, and the filter belt with the material sandwiched therebetween passes the plurality of pre-pressing rollers in a serpentine manner.

5. An adaptive multi-layer pressure filtration system according to claim 1, wherein: The filter press device further comprises a discharging device, the discharging device comprises a discharging roller assembly which can move back and forth, the discharging roller assembly comprises two discharging rollers, the filter belt wrapped with material passes between the two discharging rollers, the discharging roller assembly drives the filter belt to move in the opposite direction of the folding direction, so as to separate the multi-layer material layer by layer and restore it to a belt shape.

6. An adaptive multi-layer pressure filtration system according to claim 1, wherein: The upper track mechanism and the lower track mechanism each comprise a first sprocket, a second sprocket, a track, a net carrier and a tensioning mechanism, the track is connected end to end and surrounds the first sprocket and the second sprocket in a runway shape, the first sprocket and the second sprocket drive the track to move, the net carrier surrounds the outside of the track, and the net carrier is tensioned by the tensioning mechanism; The front end of the net carrier of the lower track mechanism is located below the folding device, and the rear end of the net carrier of the lower track mechanism is connected to the discharging device.

7. An adaptive multi-layer filter pressing method using the adaptive multi-layer filter pressing system according to any one of claims 1 to 6, characterized in that: The method comprises the following steps, S1, distributing: distributing the material on the filter belt and sending the filter belt wrapped with the material into the pre-pressing device; S2, pre-pressing and dewatering: pre-pressing and dewatering the filter belt wrapped with the material to form pre-dewatered material; S3, folding: folding the pre-dewatered material into multi-layer material in the folding device; S4, filter pressing: dewatering the multi-layer material in the filter pressing area of the filter pressing device, and increasing the pressure on the multi-layer material during the forward movement of the multi-layer material, when the pressure reaches the preset pressure value, the output end of the pressure executing element rises with the upper pressing plate, so that the multi-layer material can pass through the filter pressing area; S5, unloading: after the multi-layer material passes through the filter pressing area, the multi-layer material is pulled open to restore to a belt-shaped dewatered material, then the material on the filter belt is scraped off, and the filter belt returns to the distributing device for distributing.

8. An adaptive multi-layer pressure filtration method according to claim 7, characterized in that: In step S4, after the multi-layer material enters the filter pressing area of the filter pressing device, the forward movement is stopped first, part of the free water is dewatered, and then the forward movement is continued.

Images