A sludge solidification device for dredged sludge pretreatment

Abstract

The application discloses a sludge solidification device for sludge pretreatment, and relates to the technical field of sludge treatment, which comprises a treatment tank body, and a filter press is arranged in the treatment tank body; the filter press comprises a filter plate arranged at the bottom of the treatment tank body, a spiral blade arranged at the central axis position of the treatment tank body, and a driver for driving the spiral blade to move up and down along the axial direction of the treatment tank body; the driver is connected with a shifting rod which moves synchronously with the spiral blade; a plurality of processes are integrated in a single treatment tank body, the compactness of the equipment is achieved, the number of devices, the floor area and the infrastructure cost are significantly reduced, and the device is particularly suitable for a construction site with limited space or a mobile treatment platform; the spiral blade functions as a conveying and stirring part when rotating, and directly changes into a dynamic pressing piece at the bottom end when moving downward; continuous rotation conveying ensures that the material to be extruded is uniformly and continuously supplemented to the extrusion surface, and local pressure unevenness is avoided.

Description

Technical Field

[0001] This invention relates to the field of sludge treatment technology, and in particular to a sludge solidification device for pretreatment of dredged sludge. Background Technology

[0002] With the continuous development of water environment management, waterway maintenance, and municipal construction in my country, dredging projects generate a large amount of silt with high water content and complex composition. Direct discharge of this type of silt will cause secondary pollution to the environment and occupy a large amount of land. Therefore, its harmless, reduced-volume, and resource-based treatment has become a technical challenge to be solved. Pretreatment and solidification are key steps in transforming dredged silt into geosynthetic materials that can be utilized for resource recovery.

[0003] Currently, the pretreatment and solidification of dredged sludge typically involves multiple independent processes and equipment. The conventional process generally includes: first, transporting the dredged sludge to a homogenization tank; then adding a solidifying agent (such as cement or lime) and forcibly mixing it using a mixer; the mixed slurry is then pumped or conveyed to specialized dewatering equipment (such as a plate and frame filter press, belt filter press, or centrifuge) for solid-liquid separation; the resulting sludge cake is then further cured or utilized as needed. While this traditional technical approach is widely used, it has the following significant drawbacks:

[0004] The process involves multiple steps such as mixing, conveying, and dewatering, requiring different equipment to operate in series. The large number of equipment and complex pipelines result in a large footprint and high infrastructure costs for the entire processing system. It is particularly unsuitable for deployment in space-constrained construction sites or situations requiring mobile processing. The repeated transfer and unloading of materials between different equipment, as well as repeated start-ups and shutdowns, leads to high overall energy consumption. In addition, mixing and dewatering are two independent processes with poor coordination. The conveying process of mixed materials may cause segregation or secondary sedimentation, affecting the subsequent dewatering effect. Summary of the Invention

[0005] The purpose of this invention is to provide a sludge solidification device for pretreatment of dredged sludge, which integrates multiple processes into a single treatment tank, achieving extreme compactness of the equipment and significantly reducing the number of devices, floor space, and infrastructure costs. The spiral blades act as both conveyors and mixers when rotating, and their bottom ends directly transform into dynamic pressing plates when moving downwards.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sludge solidification device for pretreatment of dredged sludge, comprising a treatment tank, wherein a filter press is provided inside the treatment tank;

[0007] The filter press includes: a filter plate disposed at the bottom of the processing tank, a spiral blade disposed at the central axis of the processing tank, and a driver for driving the spiral blade to move up and down along the axis of the processing tank, wherein the driver is connected to a lever that moves synchronously with the spiral blade.

[0008] The feeding assembly located above the spiral blades is used to dispense treatment agents into the treatment tank.

[0009] A linkage connecting the driver and the spiral blade is used to synchronously drive the spiral blade to rotate around its axis when the driver drives the spiral blade to move up and down;

[0010] The rotating spiral blades are used to convey sludge downwards and to initially mix the sludge with the treatment agents from the feeding assembly.

[0011] The synchronously moving lever is used to agitate and stir the mixture during transport to enhance the mixing effect;

[0012] While the spiral blades rotate and convey material, the driver drives them to move downwards, so that the bottom end of the spiral blades squeezes and dehydrates the mixture located on the filter plate.

[0013] Furthermore, the filter plate is composed of two half-plates connected by a shaft in the middle, and the two half-plates can rotate around the shaft respectively.

[0014] Furthermore, the bottom end of the spiral blade is connected to an oblique pressure plate.

[0015] Furthermore, the driver includes a drive motor, a main drive rod, a movable plate, and a limiting component. The drive motor is fixed to the top of the processing tank, and the output end of the drive motor is connected to the main drive rod. A movable plate is sleeved on the main drive rod, and the movable plate is connected to the spiral blade.

[0016] Furthermore, the upper end of the spiral blade is connected to a feeding plate, and the moving plate and the feeding plate are connected by a first support rod, a second support rod, and a third support rod. One end of the limiting member is connected to the feeding plate.

[0017] Furthermore, the feeding plate has a storage tank for storing the medicine, and the upper end of the storage tank is connected to the feeding assembly through a telescopic tube.

[0018] Furthermore, the limiting member is provided in two symmetrically arranged on the feeding plate. The limiting member includes an outer sleeve fixed to the inner wall of the upper end of the processing tank and a telescopic rod movably sleeved inside the outer sleeve. The telescopic rod is fixedly connected to the feeding plate.

[0019] Furthermore, the linkage includes a first ratchet assembly, a second ratchet assembly, a third ratchet assembly, a fourth ratchet assembly, a linkage rod, and a synchronization plate. The synchronization plate is respectively fitted onto the first support rod, the second support rod, and the main drive rod. The first ratchet assembly and the second ratchet assembly are mounted on the synchronization plate via bearings. The first ratchet assembly and the second ratchet assembly are respectively fixedly fitted onto the first support rod and the second support rod. The synchronization plate is also connected to the main drive gear ring via bearings. The main drive gear ring is fitted onto the main drive rod and meshes with the gears on the first ratchet assembly and the second ratchet assembly.

[0020] Furthermore, the third ratchet assembly is sleeved on the other end of the first support rod, and the linkage rod and the second support rod are driven by gears. The fourth ratchet assembly is sleeved on one end of the linkage rod, and a rotating gear is sleeved on the central ring of the spiral plate. The rotating gear meshes with the gears on the third ratchet assembly and the fourth ratchet assembly respectively.

[0021] Furthermore, an inner hole is provided at the center of the main drive rod, and an inner ring plate is provided inside the inner hole. The inner wall of the main drive gear ring is connected to the inner ring plate through an extension plate. A sliding groove for sliding the extension plate is provided on the outer wall of the main drive rod. A center plate is provided at the center of the inner ring plate. The center plate is set in the inner hole by a spring. One end of the lever passes through the sliding groove and is hinged to the extension rod at one end of the center plate.

[0022] The technical effects and advantages of this invention are as follows:

[0023] 1. This invention integrates multiple processes into a single processing tank, achieving extreme compactness of the equipment. This significantly reduces the number of devices, floor space, and infrastructure costs, making it particularly suitable for space-constrained construction sites or mobile processing platforms. The spiral blades act as conveyors and mixers during rotation, and their bottom ends transform into dynamic pressing plates as they descend. During this downward rotation, the spiral blades create a dynamic gradient extrusion of the sludge from top to bottom. The continuous rotation of the spiral blades ensures that the material to be extruded is uniformly and continuously replenished to the extrusion surface, avoiding uneven local pressure and achieving a higher and more uniform final dehydration rate. The resulting mud cake has lower moisture content and more consistent strength. The rotation of the spiral blades itself generates axial and radial mixing effects. The superimposed levers further cut and tumble the material during synchronous movement, creating a strong three-dimensional composite mixing effect. This ensures that the powdered or liquid curing agent and the high-viscosity sludge are fully and quickly microscopically dispersed and contacted during transport, avoiding agent clumping or mixing dead zones. This creates optimal conditions for subsequent curing reactions, thereby reducing the amount of curing agent used and improving the uniformity and overall strength of the cured body.

[0024] 2. The bottom end of the spiral blade of this invention is connected to an inclined pressing plate. The inclined surface of the inclined pressing plate contacts the silt surface in an approximate scraper-like manner. Its rotational motion continuously smooths and pushes the surface silt towards the periphery or a specific direction. When the inclined pressing plate rotates and smooths in the reverse direction, its contact line with the mud cake moves continuously, equivalent to a rolling pressure head. This decomposes the vertical downward pressure along the inclined surface and transmits it to the mud cake surface in the form of a moving contact band. This dynamic pressure transmission method avoids the phenomenon of excessively high or low local stress common under static pressure heads, making the compressive stress more evenly distributed on the surface and shallow layer of the mud cake. Under the same driving force, the mud cake... The overall compression and dehydration is more consistent and the energy utilization efficiency is higher, reducing the ineffective energy consumption caused by stress concentration. During the pressing process, the inclined platen rotating in the opposite direction has a continuous tangential relative motion between its inclined surface and the wet and sticky sludge surface, which generates shearing and peeling action. This can effectively prevent highly viscous sludge particles from adhering and accumulating on the platen surface. Material that tries to adhere to the inclined surface will be quickly scraped off and reintegrated into the sludge cake, ensuring that the working surface of the inclined platen remains clean and in a low-resistance state. This ensures the continuous stability of the filtration efficiency and avoids the problem of inaccurate pressure transmission or the need for frequent shutdowns for cleaning due to material adhesion. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 This is a half-sectional view of the processing tank structure of the present invention;

[0027] Figure 3 This is a schematic diagram of the open structure of the filter plate of the present invention;

[0028] Figure 4 This is a schematic diagram of the filter press structure of the present invention;

[0029] Figure 5 This is a bottom view of the filter press structure of the present invention;

[0030] Figure 6 This is a half-sectional view of the filter press structure of the present invention;

[0031] Figure 7 This is a diagram showing the downward movement of the moving plate, the feeding plate, and the spiral blade of the present invention.

[0032] Figure 8 For the present invention Figure 7 Enlarged view of point A

[0033] Figure 9 This is a schematic diagram of the linkage structure of the present invention;

[0034] Figure 10 For the present invention Figure 9 Enlarged view of point B.

[0035] In the picture:

[0036] 1. Tank; 11. Pipeline;

[0037] 2. Filter press components; 21. Filter plate; 22. Spiral blade; 221. Inclined pressing plate; 222. Feeding plate; 223. Rotary gear; 23. Driver; 231. Drive motor; 232. Main drive rod; 2322. Inner ring plate; 233. Moving plate; 2331. First support rod; 2332. Second support rod; 2333. Third support rod; 234. Limiting component; 2341. Outer sleeve; 2342. Telescopic rod; 24. Lever; 3. Feeding assembly; 31. Telescopic tube;

[0038] 4. Linkage component; 41. First ratchet assembly; 42. Second ratchet assembly; 43. Third ratchet assembly; 44. Fourth ratchet assembly; 45. Linkage rod; 46. Synchronizing plate; 461. Main drive gear ring. Detailed Implementation

[0039] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] Reference Figure 1 - Figure 10 The present invention provides a sludge solidification device for pretreatment of dredged sludge, including a treatment tank 1, a filter press 2 is provided inside the treatment tank 1, and a pipe 11 for sludge transportation is connected to the outer wall of the treatment tank 1.

[0041] The filter press 2 includes: a filter plate 21 disposed at the bottom of the processing tank 1, a spiral blade 22 disposed at the central axis of the processing tank 1, and a driver 23 for driving the spiral blade 22 to move up and down along the axial direction of the processing tank 1. The driver 23 is connected to a lever 24 that moves synchronously with the spiral blade 22.

[0042] The feeding assembly 3, located above the spiral blade 22, is used to add treatment agents into the treatment tank 1.

[0043] The linkage 4 connecting the driver 23 and the spiral blade 22 is used to synchronously drive the spiral blade 22 to rotate around its axis when the driver 23 drives the spiral blade 22 to move up and down.

[0044] The rotating spiral blade 22 is used to convey sludge downwards and to initially mix the sludge with the treatment agent from the feeding assembly 3.

[0045] The synchronously moving lever 24 is used to stir and agitate the mixture during conveying to enhance the mixing effect;

[0046] While the spiral blade 22 rotates and conveys the material, the driver 23 drives it to move downward, so that the bottom end of the spiral blade 22 squeezes and dehydrates the mixture located on the filter plate 21.

[0047] The spiral blades 22 act as conveyors and mixers during rotation, and their bottom ends transform into dynamic compression plates during downward movement. This integrates multiple processes into a single processing tank 1, achieving extreme compactness and significantly reducing the number of devices, floor space, and infrastructure costs. It is particularly suitable for space-constrained construction sites or mobile processing platforms. During the downward rotation of the spiral blades 22, a dynamic gradient compression of the sludge is formed from top to bottom. The continuous rotation and conveying of the spiral blades 22 ensures that the material to be compressed is evenly and continuously replenished to the compression surface, avoiding uneven local pressure and thus achieving higher efficiency. A more uniform final dehydration rate results in mud cakes with lower moisture content and more consistent strength. The rotational conveying of the spiral blades 22 itself generates axial and radial mixing effects. The superimposed levers 24 further cut and tumble the material during synchronous movement, forming a strong three-dimensional composite mixing effect. This ensures that the powdered or liquid curing agent and the high-viscosity sludge are fully and quickly microscopically dispersed and contacted during the conveying process, avoiding agent agglomeration or mixing dead zones. This creates optimal conditions for the subsequent curing reaction, thereby reducing the amount of curing agent used and improving the uniformity and overall strength of the cured body.

[0048] The filter plate 21 consists of two halves connected by a shaft. Each half can rotate around the shaft. An external motor controls the two halves to rotate and open to the sides, dismantling the support base of the mud cake from the bottom and tearing and peeling it off. This allows the formed mud cake to fall off quickly and completely under gravity or with slight assistance, solving the problem of mud cake adhering to and remaining on the filter plate 21. This achieves automated and clean unloading, ensuring a continuous production rhythm.

[0049] The bottom section of the spiral blade 22 is connected to an inclined pressure plate 221. The inclined surface of the inclined pressure plate 221 contacts the silt surface in an approximate scraper-like manner. Its rotational motion continuously smooths and pushes the surface silt outwards or in a specific direction. When the inclined pressure plate 221 rotates and smooths in the opposite direction, its contact line with the mud cake moves continuously, equivalent to a rolling pressure head. This decomposes the vertical downward pressure along the inclined surface and transmits it to the mud cake surface in the form of a moving contact band. This dynamic pressure transmission method avoids the phenomenon of excessively high or low local stress common under static pressure heads, making the compressive stress more evenly distributed on the surface and in the shallow layer of the mud cake. Under the same driving force, the mud cake... The overall compression and dehydration is more consistent and the energy utilization efficiency is higher, reducing the ineffective energy consumption caused by stress concentration. During the pressing process, the inclined plate 221 rotating in the opposite direction has a continuous tangential relative motion between its inclined surface and the wet and sticky sludge surface, which generates shearing and peeling action. This can effectively prevent highly viscous sludge particles from adhering and accumulating on the plate surface. Material that tries to adhere to the inclined surface will be quickly scraped off and reintegrated into the sludge cake, ensuring that the working surface of the inclined plate 221 always remains clean and in a low-resistance state. This ensures the continuous stability of the filtration efficiency and avoids the problem of inaccurate pressure transmission or the need for frequent shutdowns for cleaning due to material adhesion.

[0050] The driver 23 includes a drive motor 231, a main drive rod 232, a moving plate 233, and a limiting member 234. The drive motor 231 is fixed to the top of the processing tank 1. The output end of the drive motor 231 is connected to the main drive rod 232. The moving plate 233 is sleeved on the main drive rod 232. The outer wall of the main drive rod 232 is provided with threads. The moving plate 233 is sleeved on the main drive rod 232 through a threaded pair.

[0051] A feed plate 222 is connected to the spiral blade 22. The moving plate 233 is connected to the feed plate 222 by a first support rod 2331, a second support rod 2332 and a third support rod 2333. One end of the limiting member 234 is connected to the feed plate 222.

[0052] Specifically, a central ring is fixed at the center of the spiral blade 22, and the central ring is movably sleeved on the outer wall of the main drive rod 232. The central ring is axially connected to the feed plate 222.

[0053] Two limiting members 234 are symmetrically arranged on the feeding plate 222. The limiting member 234 includes an outer tube 2341 fixed to the inner wall of the upper end of the processing tank 1 and a telescopic rod 2342 movably sleeved inside the outer tube 2341. The telescopic rod 2342 is fixedly connected to the feeding plate 222.

[0054] Specifically, the upper end of the outer sleeve 2341 is connected to the inner wall of the top of the processing tank 1. The bottom end of the telescopic rod 2342, which is movably fitted inside the outer sleeve 2341, is fixedly connected to the feeding plate 222. The feeding plate 222 cannot rotate due to the restriction of the telescopic rod 2342 and the outer sleeve 2341. Since the feeding plate 222 is connected to the moving plate 233 through the first support rod 2331, the second support rod 2332, and the third support rod 2333, the restriction of the feeding plate 222 is transmitted to the moving plate 233 through the first support rod 2331, the second support rod 2332, and the third support rod 2333, thus preventing the moving plate 233 from rotating. When the drive motor 231 starts, it directly drives the moving plate 233. The main drive rod 232 connected to the output end rotates. When the main drive rod 232 rotates, the moving plate 233 and the feeding plate 222 are connected synchronously and restricted by the limiting member 234. They cannot rotate together with the main drive rod 232, thus converting the rotational motion into its own linear up and down movement. The central ring of the spiral blade 22 is axially connected to the upper feeding plate 222. Therefore, the up and down movement of the moving plate 233 directly drives the feeding plate 222 and the entire spiral blade 22 assembly to rise and fall synchronously. When the feeding plate 222 moves up and down, the telescopic rod 2342 slides inside the outer sleeve 2341, so that the feeding plate 222 can move along the axis of the telescopic rod 2342 but cannot rotate around the main drive rod 232.

[0055] The feeding plate 222 has a storage tank for storing the treatment agent. The upper end of the storage tank is connected to the feeding assembly 3 via a telescopic pipe 31. The feeding assembly 3 consists of a storage tank and a feeding pipe. The storage tank is fixed to the upper end of the treatment tank 1 by a support rod. One end of the feeding pipe is connected to the storage tank, and the other end is connected to the telescopic pipe 31. The feeding pipe and the telescopic pipe 31 are used to dispense the treatment agent.

[0056] The linkage 4 includes a first ratchet assembly 41, a second ratchet assembly 42, a third ratchet assembly 43, a fourth ratchet assembly 44, a linkage rod 45, and a synchronization plate 46. The synchronization plate 46 is respectively fitted onto the first support rod 2331, the second support rod 2332, and the main drive rod 232. The first ratchet assembly 41 and the second ratchet assembly 42 are mounted on the synchronization plate 46 via bearings. The first ratchet assembly 41 and the second ratchet assembly 42 are respectively fixedly fitted onto the first support rod 2331 and the second support rod 2332. The synchronization plate 46 is also connected to the main drive gear ring 461 via bearings. The main drive gear ring 461 is fitted onto the main drive rod 232 and meshes with the gears on the first ratchet assembly 41 and the second ratchet assembly 42.

[0057] The third ratchet assembly 43 is sleeved on the other end of the first support rod 2331. The linkage rod 45 and the second support rod 2332 are driven by gears. The fourth ratchet assembly 44 is sleeved on one end of the linkage rod 45. A rotating gear 223 is sleeved on the central ring of the spiral blade 22. The rotating gear 223 meshes with the gears on the third ratchet assembly 43 and the fourth ratchet assembly 44 respectively. Only one motor is used to reliably output both lifting and rotating actions. This greatly simplifies the power system and reduces the number of motors, reducers and electronic control components. The motion coordination is far superior to the scheme that relies on electronic synchronization of two motors. It also has strong anti-interference ability, so that no matter whether the drive motor 231 rotates forward or reverses, the rotational power can be transmitted to the spiral blade 22 through the linkage 4, ensuring that it can maintain effective rotation and stirring during the upward and downward processes. At the same time, the unidirectional transmission characteristic of the ratchet allows the spiral blade 22 to stop due to resistance or rotate due to inertia without impacting the motor when the motor is allowed to stop or reverse at a certain stage. This plays a role in overload protection and adapting to the working rhythm.

[0058] The main drive gear ring 461 is connected to the inner ring plate 2322 inside the main drive rod 232 via an extension plate, and the extension plate can slide within a groove on the outer wall of the main drive rod 232. This allows the main drive gear ring 461 to rotate synchronously with the main drive rod 232, but not to move up and down with it.

[0059] The rotation of the main drive gear ring 461 drives the gears on the first ratchet assembly 41 and the second ratchet assembly 42 that mesh with it. These two ratchet assemblies are respectively fixedly sleeved on the first support rod 2331 and the second support rod 2332. The characteristic of the ratchet assembly is to convert the bidirectional rotation of the main drive gear ring 461 into a unidirectional rotation drive of the support rod. Only when the motor rotates forward or reverse will one of the ratchet assemblies transmit torque.

[0060] The rotation of the first support rod 2331 is transmitted through the third ratchet assembly 43 at its other end, while the rotation of the second support rod 2332 is transmitted to the linkage rod 45 through the gear pair, and then transmitted through the fourth ratchet assembly 44.

[0061] The rotational motion transmitted from the third ratchet assembly 43 and the fourth ratchet assembly 44 jointly drives the rotating gear 223 that meshes with them. The rotating gear 223 is fixedly sleeved on the central ring of the spiral blade 22, thereby ultimately transmitting the rotational torque to the spiral blade 22, causing it to rotate around its own axis.

[0062] When the drive motor 231 is working, the spiral blade 22 moves up and down and rotates simultaneously.

[0063] The main drive rod 232 has an inner hole at its center, and an inner ring plate 2322 is installed inside the inner hole. The inner wall of the main drive gear ring 461 is connected to the inner ring plate 2322 through an extension plate. The outer wall of the main drive rod 232 has a groove for sliding the extension plate. A center plate is installed at the center of the inner ring plate 2322. The center plate is installed in the inner hole through a spring. One end of the lever 24 passes through the groove and is hinged to the extension rod at one end of the center plate. The lever 24 is movably installed in the inner hole of the main drive rod 232. Since the lever 24 rotates synchronously with the main drive rod 232, the lever 24 also rotates while moving up and down with the spiral blade 22, thus realizing the stirring function.

[0064] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A sludge solidification device for pretreatment of dredged sludge, comprising a treatment tank (1), characterized in that, The processing tank (1) is equipped with a filter press (2), which includes: a filter plate (21) at the bottom of the processing tank (1), a spiral blade (22) at the central axis of the processing tank (1), a driver (23) for driving the spiral blade (22) to move up and down along the axis of the processing tank (1), and a lever (24) connected to the driver (23) to move synchronously with the spiral blade (22); a feeding assembly (3) above the spiral blade (22) for feeding the processing agent into the processing tank (1); and a linkage (4) connecting the driver (23) and the spiral blade (22) for driving the spiral blade (22) to move up and down. When the actuator (23) drives the spiral blade (22) to move up and down, it synchronously drives the spiral blade (22) to rotate around its axis; the bottom section of the spiral blade (22) is connected to an inclined pressing plate (221), wherein the rotating spiral blade (22) is used to convey sludge downward and to make the sludge and the treatment agent from the feeding assembly (3) preliminarily mix; the synchronously moving lever (24) is used to stir the mixture in the conveying process to enhance the mixing effect; while the spiral blade (22) rotates to convey material, the actuator (23) drives it to move downward, so that the bottom end of the spiral blade (22) squeezes and dewaters the mixture located on the filter plate (21);The driver (23) includes a drive motor (231), a main drive rod (232), a moving plate (233), and a limiting member (234). The drive motor (231) is fixed to the top of the processing tank (1). The output end of the drive motor (231) is connected to the main drive rod (232). The moving plate (233) is sleeved on the main drive rod (232). The upper end of the spiral blade (22) is connected to the feeding plate (222). The moving plate (233) and the feeding plate (222) are connected by a first support rod (2331), a second support rod (2332), and a third support rod (2333). One end of the limiting member (234) is connected to the feeding plate (222). Next, two limiting components (234) are symmetrically arranged on the unloading plate (222). The limiting component (234) includes an outer sleeve (2341) fixed to the inner wall of the upper end of the processing tank (1) and a telescopic rod (2342) movably sleeved inside the outer sleeve (2341). The telescopic rod (2342) is fixedly connected to the unloading plate (222). The linkage component (4) includes a first ratchet assembly (41), a second ratchet assembly (42), a third ratchet assembly (43), a fourth ratchet assembly (44), a linkage rod (45), and a synchronization plate (46). The synchronization plate (46) is respectively sleeved on the first support rod (2331), the second support rod (222), and the third support rod (2341). On the main drive rod (2332) and the synchronization plate (46), a first ratchet assembly (41) and a second ratchet assembly (42) are mounted on the synchronization plate (46) via bearings. The first ratchet assembly (41) and the second ratchet assembly (42) are respectively fixedly sleeved on the first support rod (2331) and the second support rod (2332). A main drive gear ring (461) is also connected to the synchronization plate (46) via bearings. The main drive gear ring (461) is sleeved on the main drive rod (232) and meshes with the gears on the first ratchet assembly (41) and the second ratchet assembly (42) respectively. A third ratchet assembly (43) is sleeved on the first support rod (2332). At the other end of the rod (2331), the linkage rod (45) and the second support rod (2332) are driven by gears. The fourth ratchet assembly (44) is sleeved on one end of the linkage rod (45). A rotating gear (223) is sleeved on the central ring of the spiral plate (22). The rotating gear (223) meshes with the gears on the third ratchet assembly (43) and the fourth ratchet assembly (44) respectively. An inner hole is opened at the center of the main drive rod (232), and an inner ring plate (2322) is provided in the inner hole. The inner wall of the main drive gear ring (461) is connected to the inner ring plate (2322) through an extension plate. A groove for sliding the extension plate is opened on the outer wall of the main drive rod (232).

2. The sludge solidification device for pretreatment of dredged sludge according to claim 1, characterized in that, The filter plate (21) is composed of two half plates connected by a shaft in the middle, and the two half plates can rotate around the shaft respectively.

3. The sludge solidification device for pretreatment of dredged sludge according to claim 1, characterized in that, The feeding plate (222) has a storage tank for processing drug storage, and the upper end of the storage tank is connected to the feeding assembly (3) through a telescopic tube (31).

4. The sludge solidification device for pretreatment of dredged sludge according to claim 1, characterized in that, A center plate is provided at the center of the inner ring plate (2322). The center plate is set in the inner hole by a spring. One end of the lever (24) passes through the slide groove and is hinged to the extension rod at one end of the center plate.

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