Movable sludge dewatering device

Abstract

The invention discloses a movable sludge dewatering device, which belongs to the technical field of sludge dewatering, and comprises a rack, a bearing bottom plate, an electric control box, a coagulation box and a flocculation box, the flocculation box is assembled on one side of the upper end face of the rack, a metering tank is arranged on one side of the flocculation box, and a sludge inlet is formed in the lower end face of the metering tank; a stacked spiral body is obliquely mounted on the other side of the upper end face of the rack, a sewage inlet pipe is connected to the stacked spiral body, a coagulation box is arranged on the other side of the flocculation box, and the other end of the sewage inlet pipe is communicated with the coagulation box; the first concentration section, the second concentration section and the dewatering section are sequentially arranged in the stacked spiral sludge dewatering machine, and the filter seam of the first concentration section is relatively large, so that thin sludge with extremely high water content can be conveniently and quickly treated; and the mainly arranged dewatering section fixing ring is composed of two matching rings with inclined plane structures, so that a dewatering gap with a smaller width and a desliming gap with a larger width can be formed between the fixing rings, blockage in long-term use is prevented, and the cleaning effect is remarkable.

Description

Technical Field

[0001] This invention belongs to the field of sludge dewatering technology, specifically a mobile sludge dewatering device. Background Technology

[0002] Screw presses are a type of sludge dewatering machine, commonly used in dredging projects such as rivers and sewers. They are mainly used to concentrate and dewater sludge to achieve the purpose of sludge discharge. Traditional screw presses are equipped with a concentration section and a dewatering section. In the dewatering section, the sludge is squeezed to become drier and drier, and the friction increases sharply, which can easily cause dry blockage in the gaps between the stack plates at the end, preventing water in the sludge from being discharged from the gaps. Although some screw presses have self-cleaning functions, after long-term operation, fine sticky sludge will still gradually adhere to and block the gaps between the stack plates, causing the water filtration channels to narrow. The processing capacity and dewatering effect gradually decrease over time, eventually requiring shutdown for thorough cleaning, which is a cumbersome cleaning process. Summary of the Invention

[0003] To achieve the above objectives, the present invention provides the following technical solution: a mobile sludge dewatering device, comprising a frame, a load-bearing base plate, an electrical control box, a coagulation box, and a flocculation box; the frame is fixed to the upper surface of the load-bearing base plate, the flocculation box is assembled on one side of the upper surface of the frame, a metering tank is provided on one side of the flocculation box, and a sludge inlet is opened on the lower surface of the metering tank; a screw press body is inclinedly installed on the other side of the upper surface of the frame, a sludge inlet pipe is connected to the side of the screw press body near the flocculation box, a coagulation box is provided on the other side of the flocculation box, and the other end of the sludge inlet pipe is connected to the coagulation box; a discharge port is provided on the side of the screw press body away from the flocculation box, and a filtrate outlet is opened below the outer side wall of the frame; an overflow port is also opened at the lower interior of the metering tank, and a dosing pipe is vertically connected in the metering tank.

[0004] Preferably, a stirring shaft is installed in the middle of the flocculation box via a fixing plate, and a stirring motor is installed on the fixing plate. The output end of the stirring motor is connected to the stirring shaft. A spray pipe is mounted parallel to the upper end face of the stacked screw body. One end of the spray pipe is connected to a rinsing pipe, and multiple nozzles are evenly distributed on the spray pipe. An air vent is also provided below the side wall of the flocculation box.

[0005] Preferably, the main body of the stacked screw includes a dehydration tank, inside which multiple partitions are arranged vertically. A first concentration section, a second concentration section, and a dehydration section are sequentially arranged along the length of the dehydration tank. The first concentration section, the second concentration section, and the dehydration section are correspondingly and adjacently installed between two partitions. A through-type spiral shaft is rotatably connected to the first concentration section, the second concentration section, and the dehydration section, and blades are provided on the spiral shaft. A main shaft motor is installed on the side of the dehydration tank near the discharge port, and the output end of the main shaft motor is connected to the spiral shaft.

[0006] Preferably, the first concentration section, the second concentration section, and the dehydration section all include fixed rings. Multiple fixed rings are arranged at equal intervals. Multiple shafts are distributed circumferentially between adjacent partitions. The shafts are connected and fixed to each fixed ring through them. Multiple gaskets are sleeved on the shafts. The gaskets are staggered with the fixed rings. An installation gap is left between two adjacent fixed rings through the gaskets. A floating ring is provided in the installation gap.

[0007] Preferably, the thickness of the moving ring in the first concentration section is less than the thickness of the moving ring in the second concentration section.

[0008] Preferably, the pitch of the screw shaft extending into the dewatering section gradually decreases towards the discharge port, and the radius of the screw shaft gradually increases.

[0009] Preferably, each moving ring in the dewatering section is configured as a stepped ring structure and made of elastic metal material; the fixed ring is composed of two symmetrically fitted and fixed matching rings, the non-fitting surface of the matching ring is configured as an inclined structure, so that the sidewall of the matching ring has a thick part and a narrow part respectively; the narrow part of the matching ring in two adjacent fixed rings forms a dewatering gap, while the thick part of the matching ring in two adjacent fixed rings forms a desludge removal gap, the desludge removal gap is located above the dewatering gap; the moving ring is elastically squeezed and assembled between the two fixed rings.

[0010] Preferably, the width of the dewatering gap is smaller than the height of the moving ring in its non-deformed state. Two movable grooves are symmetrically opened on one of the matching rings at the desludge dewatering gap. Movable plates are embedded in the movable grooves. Limiting springs are connected between the movable plates and the matching rings. A magnetic block is fixedly installed on the other matching ring at the desludge dewatering gap. Multiple magnetic shafts are circumferentially embedded and fixed on the moving ring. The magnetic shafts and the magnetic blocks are opposite in polarity and repel each other.

[0011] Preferably, each of the movable pieces is provided with an ear hole, and a piezoelectric ceramic vibrator is provided on the matching ring. The output end of the piezoelectric ceramic vibrator is connected to the movable piece. Multiple movable pieces are divided into a group, and a linkage rod is connected to the ear hole of the movable piece. Each group of movable pieces is fixed together by the linkage rod.

[0012] Preferably, the inner wall of one end of the movable groove is provided with a beveled structure, and the movable piece slides in contact with the beveled surface of the movable groove. An inner spring is connected to the inner wall of the other end of the movable groove, and one end of the inner spring is connected to the movable piece.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] This invention employs a screw press sludge dewatering machine. When the screw shaft rotates, its blades push the sludge into a stack of plates composed of multiple fixed and moving rings. Under gravity, water in the sludge is filtered out through the gaps between the plates, achieving rapid dewatering. The internal structure of the screw press is sequentially configured with a first thickening section, a second thickening section, and a dewatering section. In the first and second thickening sections, the moving rings can move flexibly axially within the installation gaps between adjacent fixed rings. The thickness of the moving rings in the first thickening section is smaller than that in the second thickening section, resulting in relatively larger filter gaps in the first thickening section. This facilitates rapid processing of thin sludge with extremely high water content, achieving initial thickening and preventing clogging by fibrous impurities. When the sludge enters the second thickening section, its slightly smaller filter gaps provide a relatively gentle and continuous pressure on the thickened sludge. Pressurization removes some interstitial water. The main dewatering section uses a stepped ring structure with a moving ring that is elastically compressed between two fixed rings. The fixed rings consist of two matching rings with inclined surfaces, creating a narrow dewatering gap and a wide sludge removal gap. The dewatering gap is located below the sludge removal gap and has a high filtration efficiency. Under high pressure, the sludge can achieve deep dewatering, and the high filtration pressure effectively reduces the final moisture content of the sludge cake. When the piezoelectric ceramic vibrator is working, it can drive the moving ring to generate high-frequency vibration through the moving plate. The moving ring can rotate gradually under the push of the moving plate at a slow rotation speed so that the sludge adhering to the moving ring can vibrate and detach at the sludge removal gap, preventing clogging during long-term use and resulting in a significant cleaning effect. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0016] Figure 2 This is a top view of the present invention;

[0017] Figure 3 This is a right view of the present invention;

[0018] Figure 4 This is a schematic diagram of the assembly structure of the fixed ring and the moving ring located in the first and second concentration sections of the present invention.

[0019] Figure 5This is a schematic diagram of the assembly structure of the fixed ring, the moving ring, and the spiral shaft located in the dehydration section of the present invention;

[0020] Figure 6 This is a schematic diagram of the floating ring located in the dehydration section of the present invention;

[0021] Figure 7 This is a schematic diagram of the combined installation structure of the two matching rings in this invention;

[0022] Figure 8 This is a schematic diagram of the ligand structure in this invention;

[0023] Figure 9 This is a schematic diagram of the installation structure of the movable piece in this invention;

[0024] In the diagram: 1. Frame; 11. Load-bearing base plate; 12. Electrical control box; 13. Sludge inlet pipe; 14. Discharge port; 15. Filtrate outlet; 16. Spray pipe; 2. Flocculation box; 21. Coagulation box; 22. Metering tank; 23. Sludge inlet; 24. Overflow port; 25. Dosing pipe; 26. Agitator motor; 27. Drainage port; 3. Screw press body; 31. Dewatering box; 32. Baffle plate; 33. Concentrate 34. Concentration Section 1; 35. Dehydration Section; 36. Main Shaft Motor; 4. Spiral Shaft; 41. Shaft Rod; 42. Shim; 43. Floating Ring; 5. Fixed Ring; 51. Matching Ring; 52. Sludge Removal Gap; 53. Dehydration Gap; 6. Movable Plate; 61. Limiting Spring; 62. Magnetic Block; 63. Magnetic Shaft; 64. Ear Hole; 65. Linkage Rod; 66. Beveled Surface; 67. Inner Spring. Detailed Implementation

[0025] Please see Figures 1-9In this embodiment of the invention, a mobile sludge dewatering device includes a frame 1, a load-bearing base plate 11, an electrical control box 12, a coagulation box 21, and a flocculation box 2. The frame 1 is fixed to the upper surface of the load-bearing base plate 11, and rollers can be installed at the four corners of the lower surface of the load-bearing base plate 11 for easy movement and handling. The flocculation box 2 is assembled on one side of the upper surface of the frame 1. A metering trough 22 is provided on the side of the flocculation box 2 away from the coagulation box 21. A sludge inlet 23 is opened on the lower surface of the metering trough 22, through which sludge can enter the interior of the metering trough 22 from below. A screw press body 3 is installed obliquely on the other side of the upper surface of the frame 1. The end of the screw press body 3 near the flocculation box 2 is in a lower position. A sludge inlet pipe 13 is connected to the side of the body 3 near the flocculation box 2. A coagulation box 21 is provided on the other side of the flocculation box 2. The other end of the sludge inlet pipe 13 is connected to the coagulation box 21. A discharge port 14 is provided on the side of the screw press body 3 away from the flocculation box 2 for discharging dried sludge. A filtrate outlet 15 is provided on the lower side of the outer wall of the frame 1 for discharging sludge water. An overflow port 24 is also provided on the lower inside of the metering tank 22. A dosing pipe 25 is vertically connected to the metering tank 22 for adding flocculant into the metering tank 22. The flocculation effect of the flocculant is used to first separate the mud and water in the flocculation box 2. The separated sludge can enter the screw press body 3 through the sludge inlet pipe 13.

[0026] In this embodiment, a stirring shaft is installed in the middle of the flocculation box 2 via a fixing plate, and a stirring motor 26 is installed on the fixing plate. The output end of the stirring motor 26 is connected to the stirring shaft, thereby using the stirring motor 26 to drive the stirring shaft to rotate to accelerate the flocculation effect of the sludge in the flocculation box 2. A spray pipe 16 is mounted parallel to the upper end face of the screw press body 3. One end of the spray pipe 16 is connected to a rinsing pipe, and multiple nozzles are evenly distributed on the spray pipe 16. It can spray water from above the screw press body 3 through each nozzle to rinse it, which facilitates the removal of residual sludge on the screw press body 3. An air outlet 27 is also provided below the side wall of the flocculation box 2.

[0027] In a preferred embodiment, the stacked screw body 3 includes a dehydration tank 31, inside which multiple partitions 32 are arranged vertically. A concentration section 33, a concentration section 34, and a dehydration section 35 are sequentially arranged along the length of the dehydration tank 31. The concentration section 33, the concentration section 34, and the dehydration section 35 are correspondingly positioned between two adjacent partitions 32. A through-type spiral shaft 4 is rotatably connected within the concentration section 33, the concentration section 34, and the dehydration section 35. The spiral shaft 4 is equipped with blades. Thus, when the screw... When the rotating shaft 4 rotates, it can push the sludge away from the flocculation box 2. The sludge passes through the first concentration section 33, the second concentration section 34, and the dewatering section 35 in sequence. In the first concentration section 33 and the second concentration section 34, the sludge can be efficiently concentrated and filtered. In the dewatering section 35, it can be dewatered under high pressure, so that the sludge is finally pressed into a hard mud cake with low water content. A main shaft motor 36 is installed on the side of the dewatering box 31 near the discharge port 14. The output end of the main shaft motor 36 is connected to the screw shaft 4. The main shaft motor 36 is used to drive and control the screw shaft 4 to rotate at a uniform speed.

[0028] In this embodiment, the first concentration section 33, the second concentration section 34, and the dehydration section 35 all include fixed rings 5. Multiple fixed rings 5 ​​are arranged at equal intervals. Multiple shafts 41 are circumferentially distributed between adjacent partitions 32, and each shaft 41 is connected and fixed to one of the fixed rings 5. Multiple gaskets 42 are fitted onto each shaft 41, and the gaskets 42 are staggered with the fixed rings 5. An installation gap is left between two adjacent fixed rings 5 ​​through the gaskets 42. A movable ring 43 is disposed within the installation gap. The fixed rings 5, shafts 41, and gaskets 42 together form a stable cylindrical rigid frame, while the installation gap between two adjacent fixed rings 5 ​​constitutes the movement space of the movable ring 43, allowing it to move flexibly within the installation gap.

[0029] In this embodiment, the thickness of the moving ring 43 in the first concentration section 33 is less than the thickness of the moving ring 43 in the second concentration section 34. Thus, the moving ring 43 in the first concentration section 33 is relatively thin, and its axial space is small, resulting in a larger filtration gap. This allows the thin sludge with extremely high water content (usually above 99%) and good fluidity to pass through quickly and filter out a large amount of free water under gravity. In contrast, the moving ring 43 in the second concentration section 34 is relatively thick, resulting in a relatively smaller filtration gap. At this point, after a pre-concentrated section, the water content of the sludge decreases, and its fluidity weakens. Smaller filter slits allow for more continuous and tighter mechanical compression, effectively removing some interstitial water. This design avoids the rapid blockage of easily clogging impurities such as fibers and hair in the sludge at the thickening section 33, which could prevent the equipment from operating normally. On the other hand, it enables "pressure applied according to the sludge," where excessive mechanical compression is not applied to the thin sludge in the initial thickening section 33 (mainly relying on gravity), while the pressure is gradually increased for the thickened sludge. This avoids unnecessary and huge resistance in the early stages of the thickening section, allowing the screw shaft load to increase steadily, reducing the wear rate of the equipment, and extending its service life.

[0030] In this embodiment, the pitch of the spiral shaft 4 extending into the dewatering section 35 gradually decreases towards the discharge port 14, making the blade channel through which the sludge is pushed forward narrower and narrower. As a result, the axial compressive force from the blades increases dramatically, and the radius of the spiral shaft 4 gradually increases. This causes the internal space (volume) through which the sludge passes to continuously decrease, further intensifying the radial compression of the sludge and generating a strong radial compressive force. This forcefully squeezes out the interstitial water and some bound water that are the most difficult to separate from the sludge, significantly reducing the final moisture content of the sludge cake and producing a drier sludge cake.

[0031] In a preferred embodiment, each moving ring 43 in the dewatering section 35 is configured as a stepped ring structure and made of elastic metal material, possessing high flexibility and deformation capability; the fixed ring 5 is composed of two symmetrically fitted and fixed matching rings 51, the non-fitting surface of the matching ring 51 is configured as an inclined structure, such that the sidewalls of the matching ring 51 have corresponding thick and narrow portions; the narrow portions of the matching rings 51 in two adjacent fixed rings 5 ​​form a dewatering gap 53, while the thick portions of the matching rings 51 in two adjacent fixed rings 5 ​​form a sludge removal gap 52, the sludge removal gap 52 being positioned above the dewatering gap 53; thus, a series of rings are distributed along the sludge conveying direction in the dewatering section 35. Multiple sludge dewatering gaps 52 are provided, and a corresponding dewatering gap 53 is set below each sludge dewatering gap 52. The width of the sludge dewatering gap 52 is slightly larger than that of the dewatering gap 53. This allows the interstitial water in the sludge to flow through the dewatering gap 53 and be quickly discharged during high-pressure dewatering of the sludge. It should be noted that when the sludge enters the dewatering section 35, it has already undergone efficient filtration and concentration in the first concentration section 33 and the second concentration section 34. Therefore, the sludge is a continuous sludge cake with a certain degree of cohesion at this time. Thus, the sludge will not be partially discharged from the sludge dewatering gap 52 at the dewatering section 35. In addition, the moving ring 43 can also form a blocking effect at the sludge dewatering gap 52 to prevent sludge leakage.

[0032] The moving ring 43 is elastically compressed and assembled between the two fixed rings 5. The section of the moving ring 43 in the dewatering gap 53 undergoes significant deformation due to the compression, and its stepped ring structure is nearly straightened. The filter gap formed with the two side rings 51 is small. Due to the extremely small gap, the resulting capillary force and filtration pressure are extremely large, effectively separating interstitial water. The section of the moving ring 43 in the sludge removal gap 52 undergoes less compression and hardly deforms. Thus, its stepped ring structure can form an undulating filter gap with the two side rings 51. Compared with traditional screw presses, this effectively prevents sludge clogging. Traditionally, in order to achieve efficient dewatering in the dewatering section, the gap in the dewatering section needs to be further reduced, resulting in clogging. To prevent clogging, the gap is enlarged, resulting in sludge leakage. This device, through the differentiated elastic deformation of the moving ring 43, creates two different functional gaps in one structure, perfectly solving this contradiction: the small gap at the bottom efficiently discharges water, while the wide gap at the top facilitates sludge discharge. The two work together through the connection of elastic elements to achieve a non-blocking and non-leaking effect.

[0033] In this embodiment, the width of the dewatering gap 53 is smaller than the height of the moving ring 43 in its non-deformed state. Two movable grooves are symmetrically formed on one of the matching rings 51 at the desliming gap 52. Movable plates 6 are embedded in the movable grooves, and a limit spring 61 connects the movable plates 6 to the matching rings 51. A magnetic block 62 is correspondingly fixed on the other matching ring 51 at the desliming gap 52. Multiple magnetic shafts 63 are circumferentially embedded and fixed on the moving ring 43. The magnetic shafts 63 and the magnetic blocks 62 are opposite in polarity and repel each other. This arrangement provides an additional "floating" support for the moving ring 43, thereby further improving the flexibility of the moving ring 43 at the desliming gap 52 and ensuring the normal movement of the moving ring 43.

[0034] In this embodiment, each of the movable plates 6 is provided with an ear hole 64, and a piezoelectric ceramic vibrator (not shown in the figure) is provided on the matching ring 51. The output end of the piezoelectric ceramic vibrator is connected to the movable plate 6. The multiple movable plates 6 are divided into a group, and a linkage rod 65 is connected in the ear hole 64 of the movable plate 6. Each group of movable plates 6 is fixed by the linkage rod 65. That is to say, each group of movable plates 6 can achieve axial vibration of the moving ring 43 through the vibration of the piezoelectric ceramic vibrator. In this way, the section of the moving ring 43 in the sludge removal gap 52 can be vibrated to generate high-frequency shaking, which directly acts on the adhesion interface between the sludge and the moving ring 43. This can effectively overcome the adhesion force, so that the adhered sludge quickly fatigues, loosens and falls off. Thus, in conjunction with the external spray pipe 16, the moving ring 43 can achieve an active cleaning effect, preventing sludge blockage caused by long-term use.

[0035] In this embodiment, the inner wall of one end of the movable groove is configured with a chamfered surface 66. The movable piece 6 slides in contact with the chamfered surface 66 of the movable groove. An inner spring 67 is connected to the inner wall of the other end of the movable groove. One end of the inner spring 67 is connected to the movable piece 6. Especially when the piezoelectric ceramic vibrator vibrates, the movable piece 6 quickly slides out of the movable groove. At this time, the inner spring 67, under the elastic support, ensures that the movable piece 6 always slides in contact with the chamfered surface 66 of the movable groove. In this way, the movable piece 6 can move freely within the fitting ring 51. The moving ring 43 is produced by a reciprocating sliding effect on the plane, thereby achieving a micro-rotation of the moving ring 43 by utilizing the contact friction with the moving ring 43. During the continuous micro-rotation, the moving ring 43 can gradually rotate from the dewatering gap 53 to the sludge desludge gap 52, which facilitates vibration desludge removal and keeps the surface of the moving ring 43 clean. This prevents the moving ring 43 from becoming clogged in the dewatering gap 53 during long-term use, and prevents sludge from adhering, hardening, and crusting in any single location for a long time, thus fundamentally solving the risk of long-term clogging in the dewatering section 35.

[0036] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A mobile sludge dewatering device, comprising a frame (1), a load-bearing base plate (11), an electrical control box (12), a coagulation tank (21), and a flocculation tank (2); characterized in that, The frame (1) is fixed on the upper end face of the load-bearing base plate (11), the flocculation box (2) is assembled on one side of the upper end face of the frame (1), and a metering trough (22) is provided on one side of the flocculation box (2), and a mud inlet (23) is opened on the lower end face of the metering trough (22). The upper end face of the frame (1) is inclinedly installed with a screw press body (3). The screw press body (3) is connected to a sludge inlet pipe (13) on the side near the flocculation box (2). The other side of the flocculation box (2) is provided with a coagulation box (21). The other end of the sludge inlet pipe (13) is connected to the coagulation box (21). The main body of the stacked screw (3) is provided with a discharge port (14) on the side away from the flocculation box (2), and a filtrate outlet (15) is provided below the outer side wall of the frame (1). An overflow port (24) is also provided at the bottom of the metering tank (22), and a dosing pipe (25) is vertically connected in the metering tank (22).

2. The mobile sludge dewatering device according to claim 1, characterized in that, The flocculation box (2) has a stirring shaft installed in the middle by a fixing plate, and a stirring motor (26) is installed on the fixing plate. The output end of the stirring motor (26) is connected to the stirring shaft. The upper end face of the stacked screw body (3) is provided with a spray pipe (16) in parallel. One end of the spray pipe (16) is connected to the flushing pipe, and multiple nozzles are evenly distributed on the spray pipe. The flocculation box (2) is also provided with an air vent (27) at the bottom of its side wall.

3. The mobile sludge dewatering device according to claim 1, characterized in that, The stacked screw body (3) includes a dehydration tank (31), which has multiple partitions (32) arranged vertically inside. The dehydration tank (31) has a first concentration section (33), a second concentration section (34), and a dehydration section (35) arranged sequentially along its length. The first concentration section (33), the second concentration section (34), and the dehydration section (35) are installed adjacent to each other between two partitions (32). The first concentration section (33), the second concentration section (34) and the dehydration section (35) are rotatably connected by a through spiral shaft (4), and blades are provided on the spiral shaft (4); A main shaft motor (36) is installed on the side of the dehydration tank (31) near the discharge port (14), and the output end of the main shaft motor (36) is connected to the screw shaft (4).

4. The mobile sludge dewatering device according to claim 3, characterized in that, The first concentration section (33), the second concentration section (34), and the dehydration section (35) all include fixing rings (5). Multiple fixing rings (5) are arranged at equal intervals. Multiple shafts (41) are distributed circumferentially between adjacent partitions (32). The shafts (41) are connected and fixed to each fixing ring (5) through them. Multiple gaskets (42) are sleeved on the shafts (41). The gaskets (42) are staggered with the fixing rings (5). An installation gap is provided between two adjacent fixed rings (5) through a gasket (42), and a floating ring (43) is provided in the installation gap.

5. The mobile sludge dewatering device according to claim 4, characterized in that, The thickness of the moving ring (43) in the first concentration section (33) is less than the thickness of the moving ring (43) in the second concentration section (34).

6. The mobile sludge dewatering device according to claim 4, characterized in that, The pitch of the spiral shaft (4) extending into the dewatering section (35) gradually decreases towards the discharge port (14), and the radius of the spiral shaft (4) gradually increases.

7. The mobile sludge dewatering device according to claim 4, characterized in that, Each of the floating rings (43) in the dehydration section (35) is configured as a stepped ring structure and is made of elastic metal material; the fixed ring (5) is composed of two symmetrically fitted and fixed matching rings (51), and the non-fitting surface of the matching ring (51) is configured as a bevel structure, so that the sidewall of the matching ring (51) has a thick part and a narrow part respectively. The narrow part of the matching ring (51) in two adjacent fixed rings (5) forms a dewatering gap (53), while the thick part of the matching ring (51) in two adjacent fixed rings (5) forms a mud-removing gap (52), and the mud-removing gap (52) is located above the dewatering gap (53); The movable ring (43) is elastically compressed and assembled between the two fixed rings (5).

8. The mobile sludge dewatering device according to claim 7, characterized in that, The width of the dewatering gap (53) is smaller than the height of the moving ring (43) in the non-deformed state. Two movable grooves are symmetrically opened on one of the matching rings (51) at the desliming gap (52). A movable piece (6) is embedded in the movable groove. A limit spring (61) is connected between the movable piece (6) and the matching ring (51). A magnetic block (62) is fixed on the other matching ring (51) at the desliming gap (52). Multiple magnetic shafts (63) are circumferentially embedded and fixed on the moving ring (43), and the magnetic shafts (63) and the magnetic block (62) are opposite in polarity and repel each other.

9. The mobile sludge dewatering device according to claim 8, characterized in that, Each of the movable pieces (6) is provided with an ear hole (64), and a piezoelectric ceramic vibrator is provided on the matching ring (51). The output end of the piezoelectric ceramic vibrator is connected to the movable piece (6). Multiple movable pieces (6) are grouped together, and a linkage rod (65) is connected to the ear hole (64) of each movable piece (6). Each group of movable pieces (6) is fixed together by the linkage rod (65).

10. The mobile sludge dewatering device according to claim 9, characterized in that, The inner wall of one end of the movable groove is configured with a beveled surface (66) structure. The movable piece (6) slides in contact with the beveled surface (66) of the movable groove. An inner spring (67) is connected to the inner wall of the other end of the movable groove. One end of the inner spring (67) is connected to the movable piece (6).

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