High pressure dewatering mechanism and multi-layer stacked solid-liquid separation system

Abstract

The present application relates to a kind of sludge dewatering equipment, especially to a kind of high-pressure dewatering mechanism and multi-layer cumulative stacking solid-liquid separation system.The present application proposes that the upper pressing plate lower surface is designed to be downward convex, and the convex amount gradually decreases from the center to the edge, so that when the upper pressing plate presses the filter cloth and sludge cumulatively stacked on the lower top plate downward, the sludge is extruded from the center to the edge, and the extruded water is discharged from the center to the edge, improving the dewatering effect.

Description

Technical Field

[0001] This invention relates to a sludge dewatering device, and more particularly to a high-pressure dewatering mechanism and a multi-layer stacked solid-liquid separation system. Background Technology

[0002] Patent document CN221094005U describes a high-pressure reciprocating automatic dewatering device for sludge (in patent document CN114917634A, this type of device is referred to as a multi-layer stacked solid-liquid separation system, which is more appropriate; therefore, this application document refers to this type of device as a multi-layer stacked solid-liquid separation system in other places). See paragraphs 0030 to 0032 of the specification of patent document CN221094005U. The stacked sludge is squeezed and dewatered between the extended top plate of the high-pressure hydraulic cylinder and the extended top plate of the discharge hydraulic cylinder. The squeezed wastewater flows out from the filter hole of the pressure-resistant inner cylinder to the space between the pressure-resistant inner cylinder and the water collection outer barrel. The bottom of the water collection outer barrel is provided with a water outlet hole, and the wastewater is discharged from the high-pressure dewatering mechanism through the water outlet hole.

[0003] To prevent the sludge from being squeezed out, the edges of the stacked filter cloth extend beyond the edge of the pressure-resistant inner cylinder, making the stacked filter cloth lower in the center and higher at the edges inside the pressure-resistant inner cylinder. When the extended top plate of the high-pressure hydraulic cylinder squeezes and dewaters the stacked sludge, the sludge in the center is prone to poor dewatering effect. Summary of the Invention

[0004] The technical problem to be solved by the present invention is how to improve the dehydration effect of the high-pressure dehydration mechanism.

[0005] To solve the above-mentioned technical problems, the present invention proposes to design the lower surface of the upper pressure plate to be convex downwards, with the amount of convexity gradually decreasing from the center to the edge. When the upper pressure plate presses down on the filter cloth and sludge stacked on the lower top plate, the sludge is squeezed from the center to the edge, and the squeezed water is discharged from the center to the edge, thereby improving the dewatering effect.

[0006] This invention provides a high-pressure dewatering mechanism for use in a multi-layer stacked solid-liquid separation system. The high-pressure dewatering mechanism includes a frame, a base plate, a material cylinder, an upper pressure plate, an upper drive mechanism, a lower top plate, and a lower drive mechanism. The upper drive mechanism and the base plate are respectively fixed on the frame. The material cylinder includes an outer cylinder with a drain outlet and an inner cylinder with drainage holes. The lower top plate is used to support the filter cloth and sludge stacked inside the material cylinder. The lower drive mechanism is fixed on the base plate, and its drive end passes through the base plate to drive the lower top plate to move up and down. The upper pressure plate is located above the lower top plate, and the drive end of the upper drive mechanism is connected to the upper pressure plate to drive the upper pressure plate to press the filter cloth and sludge stacked on the lower top plate, thereby dewatering the sludge. The squeezed water is discharged from the drainage holes into the space between the outer and inner cylinders, and then discharged from the drain outlet into the material cylinder. The lower surface of the upper pressure plate protrudes downwards, and the amount of protrusion gradually decreases from the center to the edge.

[0007] The upper pressure plate can be rectangular, square, or circular, etc., and the structure of the lower top plate and the material cylinder should match the upper pressure plate. The convexity of the lower surface of the upper pressure plate should not be too large or too small. If it is too large, it will affect the dewatering effect of the sludge at the edge; if it is too small, it will affect the dewatering effect of the sludge in the center. This convexity should be designed with reference to the short side length / side length / diameter of the upper pressure plate. For example, the amount of convexity on the lower surface of the upper pressure plate should gradually decrease from the center point to the edge, and the ratio of the amount of convexity at the center point to the short side length / side length / diameter of the upper pressure plate should be between 1% and 5%.

[0008] Preferably, to prevent pressure from being transmitted to the lower drive mechanism when the upper pressure plate presses mud, the drive end of the lower drive mechanism is provided with multiple guide holes. Guide bolts are inserted into the guide holes from bottom to top, and the guide bolts are threaded to the lower top plate. When the lower top plate is supported by the bottom plate, there is a gap between the drive end of the lower drive mechanism and the lower top plate. This gap provides space for the lower top plate to deform, thus preventing the pressure from being transmitted to the lower drive mechanism when the upper pressure plate presses mud. Preferably, to prevent the guide bolts from being subjected to radial force when the lower drive mechanism supports the lower top plate, a limiting groove is provided on the lower side of the lower top plate corresponding to the drive end of the lower drive mechanism. When the lower top plate is supported by the drive end of the lower drive mechanism, the drive end of the lower drive mechanism is embedded in the limiting groove.

[0009] Preferably, to prevent the edges of the drain holes from scratching the filter cloth, the drain holes are strip-shaped, extending from the upper end to the lower end of the inner cylinder, with multiple drain holes evenly arranged side by side on the inner cylinder. Less preferably, the drain holes are circular, with multiple drain holes evenly arranged on the inner cylinder.

[0010] Preferably, for ease of maintenance, the material cylinder is placed on the base plate and detachably connected to the base plate, allowing it to be removed for maintenance when needed. A sealing ring or adhesive is applied between the lower side of the material cylinder and the base plate to prevent water from seeping out from between the material cylinder and the base plate. Less preferably, the material cylinder is non-detachably connected to the base plate.

[0011] Preferably, to prevent water in the inner cylinder from seeping from between the lower top plate and the bottom plate to the lower drive mechanism, a first protrusion is provided on the upper side of the bottom plate corresponding to the lower top plate, and the gap between the edge of the lower top plate and the inner cylinder is smaller than the gap between the edge of the first protrusion and the inner cylinder; when the lower top plate is supported by the bottom plate, the lower top plate is placed on the first protrusion, and a water storage space is formed around the first protrusion below the lower top plate.

[0012] Preferably, to prevent water in the inner cylinder from seeping from between the lower top plate and the bottom plate to the lower drive mechanism, a second protrusion is provided around the connection between the lower drive mechanism and the lower top plate on the upper side of the bottom plate, and a relief groove is provided on the lower side of the lower top plate corresponding to the second protrusion. When the lower top plate is supported by the bottom plate, the second protrusion is inserted into the relief groove to prevent water in the inner cylinder from seeping into the lower drive mechanism.

[0013] When the barrel is detachably connected to the base plate, preferably, to facilitate barrel installation, the base plate includes an inner support plate for supporting the lower top plate and an outer support plate for supporting the barrel, with the outer support plate surrounding the inner support plate; the edge of the inner support plate provides positioning for barrel installation, and the lower end of the inner wall of the barrel has a chamfered edge for guiding barrel installation. To reduce manufacturing difficulty, the outer support plate is welded to the inner support plate to achieve a seal between them; less preferably, the outer support plate and the inner support plate are formed from a single plate by milling.

[0014] Preferably, to facilitate cleaning of the material cylinder, the outer cylinder is provided with multiple cleaning ports, and each cleaning port is covered with an openable sealing cap. To facilitate the removal of sludge between the inner and outer cylinders through the cleaning ports, the cleaning ports should not be too small. To facilitate observation of whether there is sludge between the inner and outer cylinders, the sealing caps can be designed to be translucent.

[0015] Preferably, to prevent the material cylinder from tilting, the lower end of the material cylinder is fixed to the base plate, and the upper end of the material cylinder is fixed to the frame.

[0016] Preferably, the upper end of the inner wall of the feed cylinder is provided with a chamfer for guiding the filter cloth into the feed cylinder.

[0017] This invention provides a multi-layer stacked solid-liquid separation system, including a filter cloth receiving and releasing mechanism for receiving and releasing filter cloth, a material spreading trolley for spreading mud onto the filter cloth, a cloth pressing mechanism for pressing the filter cloth during the material spreading stage, and a high-pressure dewatering mechanism provided by this invention.

[0018] The pressing mechanism includes pressing blocks / bars and a power mechanism for driving the pressing blocks / bars to move. The high-pressure dewatering mechanism is located in front of the filter cloth take-up and unload mechanism. The pressing blocks / bars are divided into front pressing blocks / bars located in front of the upper pressing plate and rear pressing blocks / bars located behind the upper pressing plate. Preferably, the upper side of the material cylinder is provided with a sunken platform to make way for the rear pressing blocks / bars, so that the upper body of the material spreading trolley can pass over the rear pressing blocks / bars.

[0019] Preferably, to increase the space between the inner and outer cylinders, the front wall of the outer cylinder is a folded plate, so that the distance between the middle and lower parts of the front wall of the outer cylinder and the inner cylinder is greater than the distance between the upper part of the front wall of the outer cylinder and the inner cylinder; the rear wall of the outer cylinder is a folded plate, so that the distance between the middle and lower parts of the rear wall of the outer cylinder and the inner cylinder is greater than the distance between the upper part of the rear wall of the outer cylinder and the inner cylinder. Attached Figure Description

[0020] Figure 1 and 2 These are perspective views of the high-pressure dehydration mechanism according to Embodiment 1 of the present invention from different angles;

[0021] Figure 3 for Figure 1 A cross-sectional view of the high-pressure dehydration mechanism shown;

[0022] Figure 4 for Figure 1 A cross-sectional view of the upper pressure plate shown;

[0023] Figure 5 It shows Figure 3 The assembly relationship of the lower top plate is shown;

[0024] Figure 6 for Figure 1 A perspective view of the feed cylinder and drain pipe shown;

[0025] Figure 7 for Figure 6 A perspective view of the inner cylinder and the transverse and longitudinal reinforcing ribs shown;

[0026] Figure 8 for Figure 1 A perspective view of the high-pressure dehydration mechanism after the material cylinder and drain pipe have been removed;

[0027] Figure 9 and 10 for Figure 8 The high-pressure dehydration mechanism shown is a three-dimensional view from different perspectives after the lower top plate and lower drive mechanism have been removed.

[0028] Figure 11 It shows Figure 8 The drainage direction around the lower top slab is shown. Detailed Implementation Example 1

[0029] See Figures 1 to 3 A high-pressure dewatering mechanism includes a frame 1, a base plate 2, a material cylinder 3, an upper pressure plate 4, an upper drive mechanism 41, a lower top plate 5, and a lower drive mechanism 51. The upper drive mechanism 41 and the base plate 2 are respectively fixed to the frame 1. The lower top plate 5 is used to support the filter cloth and sludge stacked in the material cylinder 3. The lower drive mechanism 51 is fixed to the base plate 2, and its drive end passes through the base plate 2 to drive the lower top plate 5 to move up and down. See [reference needed] Figure 3 and 10 The base plate 2 has a clearance hole for the drive end of the lower drive mechanism 51 to pass through. A connector 20 is welded and fixed to the lower side of the base plate 2. The lower drive mechanism 51 passes through the connector 20 and is fixed to the connector 20 by bolts. The upper pressure plate 4 is located above the lower top plate 5. The drive end of the upper drive mechanism 41 is connected to the upper pressure plate 4 and is used to drive the upper pressure plate 4 to press the filter cloth and sludge stacked on the lower top plate 5, so as to dewater the sludge.

[0030] See Figure 1 and 2 To ensure stable movement of the upper pressure plate 4, an upper guide shaft 42 is also installed on the upper pressure plate 4, and a guide sleeve is provided on the frame 1 corresponding to the upper guide shaft 42; see Figure 5 and 10To ensure stable movement of the lower top plate 5, a lower guide shaft 55 is also installed on the lower top plate 5, and a guide sleeve is provided on the bottom plate 2 corresponding to the lower guide shaft 55.

[0031] See Figure 3 and 4 The lower surface of the upper pressure plate 4 bulges downwards, with the amount of protrusion gradually decreasing from the center to the edge. The upper pressure plate 4 has a square structure, and the lower top plate 5 and the material cylinder 3 are matched with the upper pressure plate 4 and are also square structures. The amount of protrusion on the lower surface of the upper pressure plate 4 gradually decreases from the center point to the edge, and the ratio of the amount of protrusion A at the center point to the side length B of the upper pressure plate 4 is between 1% and 5%.

[0032] See Figure 3 and 5 The driving end of the lower drive mechanism 51 is provided with multiple guide holes. Guide bolts 52 are inserted into the guide holes from bottom to top. The guide bolts 52 are threadedly connected to the lower top plate 5. When the lower top plate 5 is supported by the bottom plate 2, there is a gap G between the driving end of the lower drive mechanism 51 and the lower top plate 5. This gap G provides space for the lower top plate 5 to deform and blocks the pressure from the upper pressure plate 4 when pressing mud from being transmitted to the lower drive mechanism 51.

[0033] To prevent the guide bolt 52 from being subjected to radial force when the lower drive mechanism 51 supports the lower top plate 5, a limiting groove 53 is provided on the lower side of the lower top plate 5 corresponding to the drive end of the lower drive mechanism 51. When the lower top plate 5 is supported by the drive end of the lower drive mechanism 51, the drive end of the lower drive mechanism 51 is embedded in the limiting groove 53.

[0034] Before the sludge is laid, the drive end of the lower drive mechanism 51 is embedded in the limiting groove 53, which lifts the lower top plate 5. After each layer of sludge is laid, the drive end of the lower drive mechanism 51 moves downward a little. The lower top plate 5 moves downward with the drive end of the lower drive mechanism 51 under its own weight and the pressure of the filter cloth and sludge until the lower top plate 5 is blocked by the bottom plate 2. Then, the drive end of the lower drive mechanism 51 continues to move downward and separates from the lower top plate 5 until a gap G is left between the drive end of the lower drive mechanism 51 and the lower top plate 5. Then, the upper pressure plate 4 moves downward under the drive of the upper drive mechanism 41, which applies pressure to the filter cloth and sludge stacked on the lower top plate 5, squeezing out the water in the sludge. Under the pressure of the upper pressure plate 4 and the pressure of the filter cloth and sludge, the lower top plate 5 deforms. The gap G provides space for this deformation and prevents the lower top plate 5 from pressing on the drive end of the lower drive mechanism 51.

[0035] See Figure 6 and 7The feed cylinder 3 includes an outer cylinder 31 with a drain outlet (connected to a drain pipe 100) and an inner cylinder 32 with drainage holes 321. The drainage holes 321 are strip-shaped, extending from the upper end to the lower end of the inner cylinder 32 to avoid scratching the filter cloth. Multiple longitudinal drainage holes 321 are evenly arranged side by side on the inner cylinder 32. To ensure the pressure resistance of the inner cylinder 32, multiple transverse reinforcing ribs 33 and longitudinal reinforcing ribs 34 are provided on the outer side of the inner cylinder 32. A water outlet gap is left between the transverse reinforcing ribs 33 and longitudinal reinforcing ribs 34 and the outer cylinder 31. The water squeezed out of the sludge is discharged from the drainage holes 321 into the space between the outer cylinder 31 and the inner cylinder 32, and then discharged from the drain outlet of the feed cylinder 3. To facilitate the cleaning of sludge between the inner cylinder 32 and the outer cylinder 31, the outer cylinder 31 is provided with multiple cleaning ports. Each cleaning port is covered with an openable sealing cap 311. After opening the sealing cap 311, the sludge between the inner cylinder 32 and the outer cylinder 31 can be cleaned through the cleaning port without disassembling the inner cylinder 32 and the outer cylinder 31.

[0036] To facilitate the installation of the drain pipe 100, drain outlets are provided on both the left and right sides of the outer cylinder 31. The drain pipe 100 can be installed on the left side of the material cylinder 3 or on the right side of the material cylinder 3.

[0037] The inner wall of the inner cylinder 32 has a chamfered edge R1 at the upper end to guide the filter cloth into the feed cylinder 3, so that the filter cloth can enter the feed cylinder 3 smoothly and avoid the feed cylinder 3 scratching the filter cloth. The feed cylinder 3 also includes an upper sealing plate 35 and a lower sealing plate 36. The upper sealing plate 35 and the lower sealing plate 36 are sleeved on the outside of the inner cylinder 32 and welded to the inner cylinder 32. The outer cylinder 31 is sandwiched between the upper sealing plate 35 and the lower sealing plate 36 and welded to the upper sealing plate 35 and the lower sealing plate 36.

[0038] To facilitate maintenance of the material cylinder 3, the material cylinder 3 is placed on the base plate 2 and is detachably connected to the base plate 2. When necessary, the material cylinder 3 can be removed for maintenance. The lower side of the material cylinder 3 is sealed with adhesive between it and the base plate 2 to prevent water from the inner cylinder 32 from seeping out from between the material cylinder 3 and the base plate 2.

[0039] See Figure 8 and 9 To facilitate the installation of the material cylinder 3, the base plate 2 includes an inner support plate 21 for supporting the lower top plate 5 and an outer support plate 22 for supporting the material cylinder 3. The outer support plate 22 surrounds the inner support plate 21. By welding the outer support plate 22 to the inner support plate 21, a seal is achieved between the outer support plate 22 and the inner support plate 21. The inner support plate 21 and the outer support plate 22 have a thickness difference, so that the edge of the inner support plate 21 has a positioning function for the installation of the material cylinder 3. The lower end of the inner wall of the inner cylinder 32 is provided with a chamfer R2 for guiding the installation of the material cylinder 3.

[0040] To prevent the material cylinder 3 from tilting and causing the upper pressure plate 4 to misalign with the material cylinder 3, the lower sealing plate 36 is fixed to the base plate 2 with bolts, and the upper sealing plate 35 is fixed to the frame 1 with bolts. See [link to relevant documentation]. Figure 8 and 9 The frame 1 is provided with a fixing block 11 for fixing the upper sealing plate 35.

[0041] To prevent water inside the inner cylinder 32 from seeping between the lower top plate 5 and the inner support plate 21 into the lower drive mechanism 51 and causing corrosion, a first boss 211 is formed on the upper side of the inner support plate 21 by milling. The gap between the edge of the lower top plate 5 and the inner cylinder 32 is smaller than the gap between the edge of the first boss 211 and the inner cylinder 32. Therefore, when the lower top plate 5 is supported by the bottom plate 2, the lower top plate 5 rests on the first boss 211, and a water storage space S is formed around the first boss 211 below the lower top plate 5 (see...). Figure 3 ).

[0042] A second boss 212 is provided around the upper side of the first boss 211 at the connection between the lower drive mechanism 51 and the lower top plate 5. A relief groove 54 is provided on the lower side of the lower top plate 5 corresponding to the second boss 212. When the lower top plate 5 is supported by the first boss 211, the second boss 212 is inserted into the relief groove 54 to prevent water from the inner cylinder 32 from seeping into the lower drive mechanism 51. (See also...) Figure 11 After the water squeezed out of the sludge flows between the lower top plate 5 and the inner cylinder 32, it is pressed... Figure 11 The water flows out of the inner cylinder 32 through the drain hole 321 in the direction indicated by the middle arrow. Example 2

[0043] A multi-layer stacked solid-liquid separation system includes a filter cloth receiving and discharging mechanism for receiving and discharging filter cloth, a material spreading trolley for spreading mud onto the filter cloth, a cloth pressing mechanism for pressing the filter cloth during the material spreading stage, and a high-pressure dewatering mechanism as described in Embodiment 1. The high-pressure dewatering mechanism is located in front of the filter cloth receiving and discharging mechanism. The cloth pressing mechanism includes pressing blocks and a power mechanism for driving the pressing blocks to move. The pressing blocks are divided into a front pressing block located in front of the upper pressing plate 4 and a rear pressing block located behind the upper pressing plate 4, as described in patent document CN221094005U.

[0044] The upper sealing plate 35 has a recessed platform 351 on its upper side to make way for the rear pressure block. When the upper body of the material spreading trolley moves forward and pushes the filter cloth, the rear pressure block holds the filter cloth down. Because the rear pressure block presses the filter cloth onto the recessed platform 351, the upper body can pass over the rear pressure block even if it is in a lower position. If the upper sealing plate 35 does not have a recessed platform 351 on its upper side to make way for the rear pressure block, the upper body would need to be positioned higher to pass over the rear pressure block.

[0045] To increase the space between the inner cylinder 32 and the outer cylinder 31 and improve drainage performance, the front wall of the outer cylinder 31 is a folded plate, so that the distance between the middle and lower part of the front wall of the outer cylinder 31 and the inner cylinder 32 is greater than the distance between the upper part of the front wall of the outer cylinder 31 and the inner cylinder 32; the rear wall of the outer cylinder 31 is a folded plate, so that the distance between the middle and lower part of the rear wall of the outer cylinder 31 and the inner cylinder 32 is greater than the distance between the upper part of the rear wall of the outer cylinder 31 and the inner cylinder 32.

[0046] A pressure strip 56 is provided on the front and rear sides of the lower top plate 5. The pressure strip 56 is detachably installed on the lower top plate 5 and is used to fix the filter cloth.

Claims

1. A high-pressure dewatering mechanism for use in a multi-layer stacked solid-liquid separation system, the high-pressure dewatering mechanism comprising a frame (1), a base plate (2), a material cylinder (3), an upper pressure plate (4), an upper drive mechanism (41), a lower top plate (5), and a lower drive mechanism (51); the upper drive mechanism and the base plate are respectively fixed on the frame; the material cylinder comprises an outer cylinder (31) with a drain outlet and an inner cylinder (32) with a drain hole (321); the lower top plate is used to support the filter cloth and sludge stacked in the material cylinder; the lower drive mechanism is fixed on the base plate, and the drive end passes through the base plate to drive the lower top plate to move up and down; the upper pressure plate is located above the lower top plate, and the drive end of the upper drive mechanism is connected to the upper pressure plate to drive the upper pressure plate to press the filter cloth and sludge stacked on the lower top plate, thereby dewatering the sludge, and the squeezed water is discharged from the drain hole into the space between the outer cylinder and the inner cylinder, and then discharged from the drain outlet into the material cylinder, characterized in that: The lower surface of the upper pressure plate protrudes downwards, and the amount of protrusion gradually decreases from the center to the edge; the driving end of the lower driving mechanism is provided with multiple guide holes, and guide bolts (52) are inserted from bottom to top in the guide holes. The guide bolts are threadedly connected to the lower top plate. When the lower top plate is supported by the bottom plate, there is a gap (G) between the driving end of the lower driving mechanism and the lower top plate.

2. The high-pressure dehydration mechanism as described in claim 1, characterized in that: The upper pressure plate has a rectangular / square / circular structure. The amount of protrusion on the lower surface of the upper pressure plate gradually decreases from the center point to the edge. The ratio of the amount of protrusion at the center point to the short side length / side length / diameter of the upper pressure plate is between 1% and 5%.

3. The high-pressure dehydration mechanism as described in claim 1, characterized in that: The lower top plate has a limiting groove (53) on its lower side corresponding to the driving end of the lower driving mechanism. When the lower top plate is supported by the driving end of the lower driving mechanism, the driving end of the lower driving mechanism is embedded in the limiting groove.

4. The high-pressure dehydration mechanism as described in claim 1, characterized in that: The drain hole is a strip structure that extends from the upper end to the lower end of the inner cylinder. Multiple drain holes are evenly arranged side by side on the inner cylinder. Multiple transverse reinforcing ribs (33) and longitudinal reinforcing ribs (34) are provided on the outer side of the inner cylinder. A water outlet gap is left between the transverse and longitudinal reinforcing ribs and the outer cylinder.

5. The high-pressure dehydration mechanism as described in claim 1, characterized in that: The material cylinder is placed on the base plate and is detachably connected to the base plate. A sealing ring or adhesive is installed between the lower side of the material cylinder and the base plate to prevent water inside the inner cylinder from seeping out between the material cylinder and the base plate.

6. The high-pressure dehydration mechanism as described in claim 1 or 5, characterized in that: The upper side of the bottom plate is provided with a first protrusion (211) corresponding to the lower top plate. The gap between the edge of the lower top plate and the inner cylinder is smaller than the gap between the edge of the first protrusion and the inner cylinder. When the lower top plate is supported by the bottom plate, the lower top plate is placed on the first protrusion, and a water storage space (S) is formed around the first protrusion below the lower top plate.

7. The high-pressure dehydration mechanism as described in claim 1 or 5, characterized in that: A second boss (212) is provided around the upper side of the bottom plate at the connection between the lower drive mechanism and the lower top plate. A relief groove (54) is provided on the lower side of the lower top plate corresponding to the second boss. When the lower top plate is supported by the bottom plate, the second boss is inserted into the relief groove to prevent water in the inner cylinder from seeping into the lower drive mechanism.

8. The high-pressure dehydration mechanism as described in claim 6, characterized in that: A second boss (212) is provided around the upper side of the bottom plate at the connection between the lower drive mechanism and the lower top plate. A relief groove (54) is provided on the lower side of the lower top plate corresponding to the second boss. When the lower top plate is supported by the bottom plate, the second boss is inserted into the relief groove to prevent water in the inner cylinder from seeping into the lower drive mechanism.

9. The high-pressure dehydration mechanism as described in claim 5, characterized in that: The base plate includes an inner support plate (21) for supporting the lower top plate and an outer support plate (22) for supporting the material cylinder. The outer support plate surrounds the inner support plate. By welding the outer support plate to the inner support plate, a seal is achieved between the outer support plate and the inner support plate. The edge of the inner support plate has a positioning function for the installation of the material cylinder. The lower end of the inner wall of the material cylinder is provided with a chamfer (R2) for guiding the installation of the material cylinder.

10. The high-pressure dehydration mechanism as described in claim 1, characterized in that: The outer cylinder is provided with multiple cleaning ports, and the cleaning ports are covered with openable sealing caps (311).

11. The high-pressure dehydration mechanism as described in claim 1, characterized in that: The lower end of the barrel is fixed to the base plate, and the upper end of the barrel is fixed to the frame.

12. The high-pressure dehydration mechanism as described in claim 1, characterized in that: The upper end of the inner wall of the barrel is provided with a chamfer (R1) to guide the filter cloth into the barrel.

13. A multi-layer stacked solid-liquid separation system, comprising a filter cloth receiving and discharging mechanism for receiving and discharging filter cloth, a material spreading trolley for spreading mud onto the filter cloth, and a cloth pressing mechanism for pressing down the filter cloth during the material spreading stage, characterized in that: The multi-layer stacked solid-liquid separation system includes a high-pressure dehydration mechanism as described in any one of claims 1 to 12.

14. The multilayer stacked solid-liquid separation system as described in claim 13, characterized in that: The pressing mechanism includes pressing blocks / bars and a power mechanism for driving the pressing blocks / bars to move. The high-pressure dewatering mechanism is located in front of the filter cloth take-up and unload mechanism. The pressing blocks / bars are divided into front pressing blocks / bars located in front of the upper pressing plate and rear pressing blocks / bars located behind the upper pressing plate. The upper side of the material cylinder is provided with a recessed platform (351) for making way for the rear pressing blocks / bars.

15. The multilayer stacked solid-liquid separation system as described in claim 14, characterized in that: The front wall of the outer cylinder is a folded plate, making the distance between the middle and lower parts of the front wall of the outer cylinder and the inner cylinder greater than the distance between the upper part of the front wall of the outer cylinder and the inner cylinder; the rear wall of the outer cylinder is a folded plate, making the distance between the middle and lower parts of the rear wall of the outer cylinder and the inner cylinder greater than the distance between the upper part of the rear wall of the outer cylinder and the inner cylinder.

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